Just wanted to provide all of you interested party with a brief update -- I didn't get a chance to make as much progress as I had wanted over the Christmas holiday, what with family and stuff, so I don't have the electrical prototype completed yet. I had been kicking around a few options, but I think I've settled on an all-in-one solution that will allow you to connect the T500 pedals with the load cell mod directly to the T500RS wheel, OR to use the pedals as a stand-alone controller device using the Bodnar cable, or possibly a Derek Speare option if he comes out with something similar.
Anyway, I'm attaching a copy of the physical diagram -- I'm looking at 4 different input/output cables, so the per-unit wiring complexity is rather large, and I want to make sure I have EVERYTHING taken into account (including over-voltage or reverse-voltage circuit protection for the load cell amp) before I hook ANYTHING up to my T500 (kind of sucks using my primary wheel as my test bed for this, but . . . someone's gotta do it, right? ).
So, I'm very, VERY close -- all I need now is a few spare hours with no distractions to get it all wired-up (easier said than done, with basketball tournaments going on and a daughter that I have to haul to cheerleading while my wife finishes-up her Master's degree).
Still, rest assured that this project is still very much alive and kicking -- at this point, I have ALL the parts on-hand for my first prototype, so the only thing that remains is for me to spend some quality time with my soldering iron and a rats nest worth of wiring in order to bring it all together. Easy, right?
In the meantime, enjoy the pretty picture showing my planned connection diagram (click to enlarge), and imagine it all attached to YOUR T500RS pedals to provide you with some load cell goodness!