Wonderful! Thank you Sheepster.
I am not making my own, but have a contact in England connected with the people doing the conversions that is making the carts available to those on AA who request them, some like Painter, they did a run of a while back and had a few left available. The carts available in the AA store are USA made. I can get you an email/contact if you are interested in acquiring any.
EDIT: Yes, Will absolutely post a shelfie soon of all the ST UGC's! and one with carts next them. Love it!