Episode 4 - Glue Sizing, Pre-finishing, Plywood Bottoms & More!

Guys Questions: 1) Hey Guy, love your channel and have been a long time watcher. I have a question semi-related to this video I was hoping you could help with. Here you framed a solid piece of wood, how doesn't the expansion and contraction of that piece cause cracks in the frame? The reason this came up is that I desire to make a dresser, and was trying to sort out how to frame the sides without using a lamination. Any explanation here would be great. Thanks again. 2) Was wondering, did you use different glue for the sizing, and did you glue the boarder on while the glue for the sizing was still wet?   Huy's Questions: 1) Why did you apply a washcoat of shellac (actually, it was a prefinish coat and not a washcoat) on your tool cabinet? 2) Why did you drawbore peg and wedge the through mortise and tenon on your trestle table?   Sean's Questions: 1) Why did you use a plywood bottom in your mahogany blanket chest? 2) Do you sand between every coat of finish and what do you use to remove dust between coats of finish?