I didn't read the last 4 posts but here is what I would recommend and comment on.... First off, you want something cheap? Well to find a 20's or 30's rod will be hard to get in the first place. Second they aren't going to be cheap IF you find one. Now for the frame, you can't use much of anything because the narrowness of them. What you CAN do is go to somewhere like "Speedway Motors" and order their frame rail kit with the rear end and front end too if wanted or JUST the rails themselves. (That is if you have a body). You can also look at Speedway Motor's full T bucket kits as well. They are not the BEST glass bodies around but with some work they can be made nice. Either way, if you find a old 20's or 30's it may be rusted and take a LOT of metal work to fix so why not just do the same with a glass body? Who care's if it's not real, it still looks sweet IMO. It may take about 8 grand to build one from the frame up including all the little things like wirings, brakes, brake lines, etc but if you are smart and you get a junkyard car then you can use things off of that car and put it into the kit.
Now say you don't want to go this route... Then look for something like a 40's or 50's car. May not be a "hot rod" but it will make a sweet custom or led sled and roomier as well. (means you can fit a lot of those high school hunnies in em) heh. You can find something like this for a pretty decent price with or without a motor. Of course the cheaper ones will require things like interior, wiring probably, small things like headlights, a little rust repair and new paint but still worth it if you find the right deal.
Good luck on this and I hope you find something that you like. At least you are into hot rods though, we need more guys our age into the hobby.