RE: glueing sheeting togeather
Trim the edge of both sheets so you have a perfectly square and straight cut. Put 1" wide masking tape lengthwise holding some pressure so the edges are tight. Turn over and bend 45 degrees. Use a small diameter of titebond or white glue on the edges. Straighten out the glued sheets and use a credit card to wipe off the excess. I then cover mine with wax paper and lay a glass shelf on top.
Just how I do it. White glue sands well and the glass plate keeps the sheeting even.
John