ive just been looking at making spindles and i was wondering what a comperable weight would be.
im thinking about trying to use the wide 5 wheels/hubs that some of the late models uses. the wheels run 8.10lbs for a 16x6 to 15.60lbs for a 16x18!!!! wheel. (16x11 is 10.80 lbs) the hubs (which are the hub, "wheel spokes" and brake rotor hat -- has the 8 on 7" brake rotor bolt pattern on the hub) weigh 6.71lbs and are not too expensive at around $100 each.
http://www.stockcarproducts.com/rear12d.htmthe wheels can be purchased for around $150 each.
for the spindles, winters and a few other manufactures make aluminum bolt on spindles to go in the end of a quick change live axle housing, which you could use on a homemade upright.
I am thinking about using one of the front wheel drive v8 setups out there in a midlana style chassis---- i relize the weight penalty, but I find myself rediculasly attracted to the v8 sound, (ive owned (in order) a 94 corvette, 96 miata, 03 s2000, 03 bmw 325, 07 bmw 335 and just recently a $150 running 91 camaro) and even though the miata was much more fun to drive than basicly all of them when i got back in a v8 (the cheep camaro - which is probly only slightly faster than the miata in a straight line) i realized how much i missed the sound.