Couple of updates:
It is possible to get all of the parts via Amazon, but.....
Don't forget the 3v to 5v booster...1 – Adafruit 3v to 5v booster …................................................... $2.95 ( HERE ) or $7.00 ( HERE ) with free freight.
I took a look and on the way found this place but have never ordered from them but looks like they might have all the Adafruit items....
https://www.electromaker.io/Might be worth a look. I bookmarked it for myself. If you order there report back on the service.
I finished printing all of the parts for the 'straight' SpeedTrap and assembled them today and got a good part of the wiring done in 2 hours. Should be able to finish in another 1-2 hours and then test it. If all is well, don't see why it won't be might get the print files up tomorrow.
You probably noticed but the software is up also, so everything to build the curved one is there and the files for the straight one should be up tomorrow or the next day.
https://www.therailwire.net/forum/index.php?topic=58052.msg801335#new
Sumner