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    Trying to create a sunrise/sunset power up/down LED strip

    That is a lot of heat. In days gone by we used to use a 10W pilot bulb inside an old refrigerator as a heat source to keep welding rods dry. Even at that, the rods were extremely hot. So unless your plan is to add chips to those fish............o_Oo_O
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    'Letraset' type dry transfers for PCB pads chemical etch resist

    I still make the odd trial board here but be aware there are many laser printers where the toner is not refusable. i'e' it melts onto the paper original but reheat does not work. HP do work ok but that depends on the toner you are using i.e. if after market may not work......mine do though...
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    NE555 reset pin using transistor

    Try facing North when you post your photos. East is a real PIA.
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    'Letraset' type dry transfers for PCB pads chemical etch resist

    Haven't seen that stuff for 20 years or more. No need for it. One can get pcb's made these days for a couple of dollars for 5 pieces. If you just need a basicic in row layout. you can buy board already laid out for much the same price from Ebay etc.
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    Change 3 phase Steam Boiler to 3 phase Hot Water Boiler?

    I showed you a circiut diagram above.
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    NE555 reset pin using transistor

    Here is a pdf of an old circuit from way back when Adam was a boy. I tend to use MJ10012 which is a darlington transistor designed for ignition coil switching.
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    Beta and VHS repairs

    Probably no one unless you can round up an old techie somewhere willing to help. Most have closed their doors yonks ago, not worth the effort anymore. Sunshine Coast would I imagine be full of cafe latte sipping hiso's these days anyhow.
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    NE555 reset pin using transistor

    Pin 4 should work. Show your circuit diagram including supply levels etc.
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    Which Arduino motor control?

    This is not normally the case.
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    Which Arduino motor control?

    Brushless motors usually have more grunt per pound. Below is a typical solenoid but only 10mm throw @ around 0.6kg An idea you will need to experiment with. https://core-electronics.com.au/large-push-pull-solenoid.html Thing is, no one here is going to design a project for you.
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    Which Arduino motor control?

    Any Arduino would work. There would be a need to drive in both directions so a h-bridge if using a dc motor. There are other ways but that is a "module" so to speak with inputs a uC can interface with. As I said previously, I doubt very much those hobby motors will come anywhere near...
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    VFD voltage

    Well then, use this.
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    Large chip with no markings

    Looks like a surface mount cap.
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    VFD voltage

    So where is the 24v transformer now? Your reasoning doesn't make any sense. If the vfd is on the wall with a mains supply , put the 24v transformer there.
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    Fine movement of 12v motor on pan/tilt head

    Not negative going, no.
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    Servo or stepper? Help please!

    If you need to have a moving force of some 20lb some so far unknown distance in 20 milliseconds you are going to need some serious hp, not a hobby motor. Start at the output and work your way back...... hp is ability to lift a certain load a certain distance in a certain time. Gear it down and...
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    Servo or stepper? Help please!

    It all depends on what you intend to use for a worm drive, what sort of reduction etc. Remembering that you need power as well as speed but 20 milliseconds I would imagine be an almost impossible task in some respects.
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    Solid-State Switch?

    AS in high side switch....???
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    Servo or stepper? Help please!

    Even at 50ms a servo or stepper is not going to have the power nor the speed. Dc motor and worm drive like you already have is best and use optical encoder for position/direction via a small microcontroller.
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    IR sensor OR something else?

    The time of flight are much more compact as far as the emitter/receiver are concerned compared to the ir unit you showed. Also it may be possible to actually measure the amount of charge within certain limits.
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