I don't know much about the s10 frame swap,a lot guys are doing it.I opted to rebuild my steering and suspension,brakes to stock standards.I'm still thinking about the front disc brake conversion.Another option I'm told adding a brake booster to the stock drum brake system makes a remarkable difference.I put a third member out of a 1958 1/2 ton Chevy with 3:90 gear ratio coupled to a 13-52-145 t5 s10 transmission.
As far as parts for the rear side windows,we need to see pictures to figure out what you're missing.Parts can be found,some take longer than others.They sell a one piece window kit as well,it eliminates the sliding windows"ebay truckman4787".
The 1/2 ton truck running boards are the same as the suburban.
I can drive my old suburban anywhere at anytime with no problems.It does really good on the highway and keeps up with traffic.
Tim
1951 3100 Chevrolet1951 Chevrolet Suburban CarryallImage"A house is built with boards and beams. A home is built with love and dreams."
"Look deep before you leap !!!" / "Everything is Everything"
"If I say a mouse can pull a house, hitch him up"