Not to burst anyone's bubble ... but don't waste your time just because you saw someone on TV using one. There are other, simpler ways to work sheetmetal. A wheel takes time and experience .. and constant practice. Once a year .. you're going to cheap out, buy a half assed **** tool with a flimsy frame and soft anvils and be disappointed in the end result. Do some calling about and find a workshop that has a good quality one if you want to make something that 'needs' a wheeling ... but frankly, there's not much you can do with a wheel that you can't get done with a sandbag and mallet, and a good quality shrinking disk.
If you're going to go ahead anyhow, be aware that any laser cut edges need to be softened, either with heat or by slicing off a thin bit. Laser cut edges are much harder than the rest of the sheet, and can mark your anvils. Yes you can stiffen the frame, you can harden the anvils ... but for once a year's use .. what's the point?