For a good number of years i’ve been after one for a scooter that will enable me to move my scoots around my garage. I have one for my Harley. Several people have said they would make me one but I heard no more. Seen this recently and it looks simple and well made. Ordered one but it’s out of stock
I made one for the guzzi when I lived in town and had a sharp turn at the bottom of the stairs to get the bike in the front room.
I used one of the kids beds. Screwed the wooden sides after cutting to length into a rectangle shape, drilled holes for the castors. B'sYU.
If it carries the guzzi - 460lb - then a lambretta should be ok
ps it also got used for moving appliances around. In and out.