Fabricating the thin birch components

I née some thin 1/4" boards for the interior tray and tray bottom. First is to get 2 reference planes (side and bottom) using the jointer. So I resawed some 3/4" boards very carefully with a thin kerf bandsaw blade. As I learned, one trick is to saw very slowly, so that the blade doesn't wander off the centerline of what you are cutting. If you push too hard, the blade will flex, baking the bottom narrower in places than the top. Even the top may wander a bit with a 3/4" blade. So, once resawn, I use the thickness planer to bring all the boards down to 3/8". Starting with the thickest board, and for each downward adjustment in the machine, send all the boards through so they are uniform thickness. One still had some saw marks in it. I will use parts of that piece for other trim. Obviously I cut extra just to be sure I'd have enough baring any major complications. I let the boards rest, to balance humidity leves, then replace to final 1/4" thickness. As they were quarter asan, ther wasn't much deviation. Next: dry clamp the carcas, remeasure the sizes of the upper tray and cut the components. For fun and interest I though I'd make large staggered finger joints and pin them with double brass brads. ( using glue of course. But befor glue up, I need to put in the mortises into the sides of the cars to accept the central lifting divider. I'll use 2 mortises on each side.