Hey I really like where this idea is heading. I have a 64 C/10 short/fleet, and have been looking at numerous front end bolt in kits from no limit, scotts, Heidts, and besides being a bit bulky (heavy) are very pricey . Just to crunch some numbers the lightest weighed in at 196lbs, a bolt in that is hub to hub (disc) with manual rack and Qa1 coil overs on Mustang II spindles.
I agree with super 73 on the Mustang II spindle, seems like they get regular abuse from other segments and continue to perform. I only mention this because of the weight vs strength argument. I also think some tube steel cross member or chromoly cross member may shave weight if engineered and done right.
I am in Temecula just up the road from you guys, if your looking for a sample truck for test fitting and test driving, I can drive the 15 minutes to you when your ready!