Hey Fettination. Congrats on joining the site! :cheers The trash can plastic is thick and tough. You may want to use "For sale" signs instead. You can buy them at Wal-Mart, Lowe's or Home Depot. They are thinner, made out of Sintra, easy to cut with either scissors or a utility knife, and Superglue glues the pieces together like nobody's business!
Watch your fingers, though.
As others have said before, work with a partner, if possible. It's always good to have another set of hands. Looking forward to seeing your work. There are lots of helpful people on this site and even more information.