We did some remodeling projects around the house this summer, and I am
left with two sliding doors that I don't want to pay to take to the dump. I
thought that they would make a nice top to a coldframe.

wow! you're gonna have a really nice-sized coldframe! around here (durham, NC)
people just take bundles of straw and lay old windows on top. some prop up the
windows slightly so that the coldframe angles toward the south.

i've never used a coldframe; i plan to build one this summer. i'm sure someone
will come along and tell you when you can plant it up!

pat