Does anyone have a set of disc to pull behind a lawn and garden tractor to till a garden or a real tractor?

I want to build a set of disc from saw blades. I read John Deere, the big tractor man, got his start by using old worn out saw blades and building disc to cut dirt that was sticking to other types of plows.

I have a 12 H.P. riding mower and intend on taking the mower deck off and useing it to plow about an acre of land, give or take 9/10's of an acre, lol.

I need to learn what the angles the blades are set at, how much of a bowl shape they have, meaning the depth of the disc laying flat, and anything else you can tell me about them.

I also need to know where to get the lugged AG type tires on the wheels for the mower, Cheap.

I am thinking of cutting two sets of wheels and welding the center of the mower wheels to a set of 13" or 14" mud and snow tires.

I think I have a set, but not sure what size they are.

Would they be good enough to get traction in the dirt on a little 12 hp mower?

I need some help on this because I don't have much money.

God Bless

Dennis