Full over Full size bunk bed using 2x4's and 2x6's. Assembled using pocket hole screws and wood glue.
Easy, Affordable, and Strong
Lumber used:
11 2x4x10'
10 2x6x10'
20 1x3' These are much cheaper if you just use 2x4's and rip them down with a table saw
Tools/hardware used:
Kreg Jig: a.co/d/33KjzFA
Kreg Screws: a.co/d/3nJ6YKp