Not having much luck with pics but I have my busness on facebook because its free but Im not shore if its ok to post that so i will tell you that my name is Mark Mathews from Readfield Maine ..I just build cabinets and dont have the talent as alot of you...I build simple cabinets with ply boxes with dados and rabbits frunt and back to except back and face frame..Rased and flat pannel doors and dove tale joints....I do nice work but have no Idea how to do alot of things that you guys can and I wish sometimes I did not this for a living because it would be a lot of fun to take your time doing anything you want and not worry about money.Thanks Mark
#20 should work. Cut a slot in a scrap the cut the slot in half. If the thinnest point is about an 1/8 you are fine. There is a depth adjustment and most machines actually cut a bit too deep. When there is only a tiny extra space the biscut needs to be centered carefully . # 10 should be strong enough if the #20 is too close. i would glue the joints in the sides and dry biscuit the bottom for alignment. Then put screws between the biscuits to attach it. are you still planning on a plastic liner of some sort ?
It was amazing how much material we had to reject, then sort the range of color and percentage of remaining paint. I put the most paint near the top as if it was under the eaves. Least paint at the bottom where sun ,rain and mud splashing up should have weathered it the most. Had to flatten the backs yet keep a varied thickness to avoid looking to perfect. Tried to not have too many nail holes in one cluster. Rustic isn't as easy as it looks !