Originally Posted by Singh007
So, the glue goes between the plywood and the front of the frame? Do I need to glue the edges of the wood pieces too? (where 2 pieces of wood are touching each other)
Nope....the Triangular Braces go across the "Back" of the Corners. When such larger, overlaying triangular wood braces are used, it can help a "one man team" get the edges alignedand laying flush to each other. But most importantly, those type of reinforced corners add considerable strength.
The only drawback is the "added thickness" a 1/2" piece of multi-layered (7 Ply) good quality Plywood adds I don't myself suggest using 1/4" Veneer-type Plywood ...but I prefer more strength.
Using "Wood Glue" is what you want to do, and Coarse Threaded Utility Screws (1-1/4" long) set flush into pre-drilled holes to prevent splitting of wood.