Modular Hangboard System
A "modular" hangboard is simply a mounted sheet of plywood over a door sill. T-nuts are liberally applied (over 100 in the below example) for mounting bolt-on holds where you want them. This is perhhaps the "simplest" climbing wall and is more versatile (and can be made larger) than a simple "fixed" hangboard. Shown below is a large "mod-board" with slopers, big pills, and our mini-crag.
Click for modboard construction how-to
Click for modboard training techniques
Screw-on hangboard componants together with bolt-on giant slopers makes for a fun, versatile workout wall. You can also forgo the t-nuts and go completely with screw-on componants (below).