Here's how mine is coming a long.

Yeah they can defenatly be done affordibly. I forget the "Kit" cost, but it think it's around 12 grand. If you have that, and a donor mustang and a couple other odds and ends, you can build one of these.

For me, it's a complete Non-donor build. all brand new, and many upgrades, so yeah i wouldn't exactly call it affordible in this case.

Here's mine so far (note, the wheels are only rollers, when everything is done, the proper measurements will be made to determine the exact widths and offsets needed.