Oh jeez. I just noticed that roll cage.
Ok, as is, the first one is a deathtrap with that cage. If it flips that thing could fold and trap you in.
That 2nd one is 70's or 80's yard kart I believe, as it doesn't look like there is any steering geometry in the front end. It may just be the angle of the pic though. It's weird that the rear end is raised like a race kart would be, but has straight front spindle anchors. If you have semi-flat open areas and aren't planning on much off-roading, this would be a decent frame for only $20.
I'd figure with a $100 HF clone included, you'll prolly spend $300 to get her going. I pulled all these prices out of my you-know-where and are rough guess-timates. Surely you could source some of these parts locally from hardware/farm stores and from online communities such as here. Heck, I got a bunch of this stuff I could sell ya.
motor 100
wheels 50
wheel hubs 25
tires 50
steering wheel 15
brake system 20 (drum)
pedals 15
tie rods, brake/throttle rods 20 (buy some steel rod and a die and cut and thread your own)
seat 30
sprocket hub and gears 30
a million little things that you will need ????