I know the scratches will happen and I will cry but for now it's all rugged up with its royal robe covered in the garage sitting on its throne. I had to make the trolley as small as possible and utilise space so I made the shelf on-top for the catcher. The "Sturdee" wheels are off an old 1950's hand trolley that rusted away years ago and was scrapped, these wheels are solid and weigh a tonne the front wheels are cast steel wheels from Bunnings and should be ok to move a few metres out of the garage to the lawn. Steel was scrap laying around from left over jobs and the cypress pine deck is salvaged from an old tv cabinet I upgraded years ago, fake grass I picked up from a supplier that sold 1m square off cuts for $10.00.
Don't use pneumatic wheels as they will always be flat when you need to move it and you will forever be pumping them up. I used smaller wheels as it keeps the trolley lower to the ground so you don't have to lift it much when taking it on and off. Old solid mower wheels are probably ideal, I wouldn't go bigger than the Rover shredder wheels, even they might be too high.