Awwww.... I get it. you meant BIG WHEEL.. not BIG wheel..... I was thinking hi wheel, penny farthing BIG wheel.. but not plastic speed racer..... I get you now
Yeah I think it will work. I dont have pictures of it but my blacksmith group made a couple of tricycles using unicycles that where auctioned off for charity. What we did was use a big old bearing for the head set. basically turned what would be the seat post into the headset and made a little adapter for the bearing to seat on. we then just welded the down tube for the bike right to the outer ring of the bearing. Worked real well and looked cool. These where big bearings. Like 3 1/2 OD and 2" wide, where bought as new salvage from a surplus store.
Sounds like a fun project.