Jeff if you're making arms the ones you should do are the 200mm conversion arms for the TC3, particularly the fronts. Those are like hen's teeth any more and the oval guys were buying 'em up a couple years ago for silly prices. It may be too late if folks have given up finding any and moved on to other chassis but might be worth taking a look into.
If needed I have some NIP to take dimensions from in exchange for a couple sets of printed ones.
Scott