Not me, but perhaps you can provide a link to this project.
Hi Bryan
welcome to the forums
have you got any links to the project ?
converting it to USB is making it somewhat more complex its going to take some additional programming to interrogate the USB for the data.
Assuming that the existing project is using RS232, why dont you just use a standard RS232 to USB converter dongle ?
but whatever way you go, GET the project working in its original form before any oddball modifications
Dave