At first glance, the uninitiated might guess that 2groggy is building a bass guitar from a reclaimed door jamb (poplar), reclaimed cedar from an old playscape and a variety of other offcuts. Those that know him have no doubt, and probably predicted this.
The 2 real questions are "What is he going to build?" and "Why?". Those that know him, know better than to ask why - they want to know how, because he tends to make things up as he goes along.
They even tolerate him referring to himself in the third person.
The "what" is a five string acoustic with the general outline of a Gibson Thunderbird.
Now the "why"... Quite frankly, due to his routine negligence in following the forum threads under his nose, he didn't know about the "5" theme until relatively late in the game. Thunderbird 5 popped into his head and stuck.
For those too young to remember, this is Thunderbird 5, from the TV series Thunderbirds are Go.