This may be a shot in the dark, but I know that generally "handy people" are just that "handy people," and typically their ability to "DIY" extends to many things, so perhaps I may request a few things that I'd like to see some DIYers for, at least in this knowledge base here at breedbay. Perhaps others looking to do it themselves could post their requests here. I just know that most everything that I could buy at a hydro store could most likely be constructed myself for much cheaper (I'm poor), but I just don't know how to do it.

Cooltube system.
Carbon scrubber.
Ebb & Flow table.
Vertical system (PVC). Tower and/or cage. (E/F, recirc, drip?)
Grow Cabinet (built yourself)
Recirculating DWC
General ventilation

Perhaps it is unfair to request How to's, but some people may enjoy the craft and allowing others to benefit.

...just puttin shit out there.