Well.. I guess you cout go at a rough mower with your welder and cutting torch.. and a big pile of scrap.. and some roller wheels and a couple front spindles and tires.. and make a mower that was no longer good as a rough cut mower.. and worked somewhat like a finish mower, with alot of sweat equity, and some decent cash outlay in parts...
You will need wheels that will caster and swivel so they won't dig in.. they will need to be set to the sides of the mowers front corners.. making it's footprint larger. You will need to have a way to adjust them to achieve the desired cut.. IE.. front down for less hp.. or front up for slightly better cut, more hp usage. You will thenneed to sharpen the mower blades much like a lawnmower blade is, instead of the 1/8 to 1/32 flat face like a rough cut mower uses.
You will then need to rig a loose toplink connection so that you can still lift it.. but that it otherwise has good float room.. or you defeat the wheels.. etc.
If you want a 'proof of concept' and just want to make something.. go for it. Oftentimes those devices don't work as good ( some work better ).. and may cost as much or more than a comercial unit.. but some of us DO like to build things... I can't fault you for that.... I've built plenty of things that would have been WAY cheaper to buy.. or faster / easier to buy... but I just wanted to do it anyway.. etc.
good luck.
Post pics if you go for it.
Soundguy
soundguy