To make it a bit easier moving around 4x8 sheets of 3/4 plywood & MDF, I put together this Panel Dolly to hold up one end of the sheet. Took about an hour with about $22 in parts.
Well done man , I was looking for something like that , I might use two small casters that I already have (not like the one you used ) they are wheels with ball bearing and axel bolt and the plate and make the the wood wider than the one you used , instead of 1x1 to 2x2 to holds the caster plate . Keep up the good work .