Lesson #1: Before making any cuts, make sure the lumber board is planed and squared!
Skewed board + poor carpentry skill = lots of hand planing, and I don't know how to use a hand plane!
I made a simple hand plane jig... it helped a lot together with some giant clamps! 2 down, 2 more to go.

This is how it will be assembled. But I must make 2 more boxes and some additional parts like the entrance, top cover, roof, and bottom board. These hive will not use any hive frames.