The leaky roof is an easy fix … I’d heard comments early in the process of wetness n leaking roofs. I know even a house roof needed a certain pitch/angle of incline to not leak. (This pitch stops backward upward movement called wicking). So I made a change in assembly plan.
I made a quick trip to the hardware store where I bought a tube of clear silicone caulking. I added a small straight seam of caulk to both side panel over laps n a double seam of clear sealant to the wooden cap piece. I have three such roofs on my hives in my apiaries. Our State of Washington has just passed thru the wettest recorded 1st October thru end of April couple days off of over 47.0" of Rain (some driven by winds up to 50 plus mph. All three dry as a bone under the lid . I had understood before hand that the roof comes prone to some weeping n leakage but since I knew that I came armed to not allowed that to happen to my hives n bees. Easy job !
Now to your second point. I’m guessing your request for buying extra SBBoards might someday become possible n available… I realize you want it NOW … They are presently providing plastic super plugs n keys are now available I understand. Saw a note on the forum on that this last month or so… I believe Dawn wrote a note on that.
So for now you are like me. We both will still be using a level bar to add a proper shim ! I did go to another outside provider to buy several more SBBoards. I just added a long shim to the entrance end of my screened boards to get that pitch. Trust me it worked n I didn’t have to wait on Flows unknown product time table. I’m sure extra parts n pieces will come sooner or later but that takes time … You n I are operating in the NOW n PRESENT so for now it’s being inventive I guess.
Cheers around the Globe,