I've done a little sleuthing, buit only really scratched the surface of what is available in the archives - so much happened when I wasn't looking ?
Here's a quick look at the (meta) data. Sorted by date fort now - havn't thought too much about tagging with descriptions since the thread titles are reasonably descriptive.
Let's see how much data we can get together - want to add another category "other" for projects that don't fit into the guitar/amp categories - E.g. I recall a electronic kit being DIY'ed with peizo buzzers...
And once we have a chunk of info, maybe have some fun and vote for "Hall of Fame" to feature our favourites?
Guitar/Bass
Build
17/09/2015 lapdawg http://www.guitarforum.co.za/setup-mods-and-repair/new-design-new-build/ (firebird/tele build)
29/07/2014 Shibbibilybob http://www.guitarforum.co.za/setup-mods-and-repair/casimi-acoustic-guitar-building-course/
and http://www.acousticguitarforum.com/forums/showthread.php?t=351112&highlight=afican+blackwood
20/01/2014 lapdawg http://www.guitarforum.co.za/setup-mods-and-repair/attempt-to-get-close-to-a-'59-burst-replica/
19/06/2014 Chabenda http://www.guitarforum.co.za/your-gear/my-bvans-striatus/
26/10/2012 Rikus http://www.guitarforum.co.za/setup-mods-and-repair/la-cabronita-build-it-starts!/
31/09/2012 Royc http://www.guitarforum.co.za/setup-mods-and-repair/dream-acoustic-guitar-build3-baranik-meridian/
31/01/2015 Peter http://www.guitarforum.co.za/bass/new-fretless-build/
30/09/2012 Peter http://www.guitarforum.co.za/your-gear/simplest-possible-bass-guitar-homebuilt-two-string-fretless/
Repair/Refurb
04/10/2015 G-Man http://www.guitarforum.co.za/setup-mods-and-repair/i-bought-a-7-string!-err-kind-of/
23/11/2014 lapdawg http://www.guitarforum.co.za/setup-mods-and-repair/crack-neck-repair-job-(my-way)/ (acoustic neck repair)
10/12/2014 Meron http://www.guitarforum.co.za/setup-mods-and-repair/project-'bat-strat'/
28/02/2012 Clint http://www.guitarforum.co.za/setup-mods-and-repair/ibanez-rg570-project/ (RG570 refinish/refurb)
09/08/2011 Joe Moore/Neon Gecko http://www.guitarforum.co.za/setup-mods-and-repair/neon-gecko-fixes-my-guitar-a-pictorial/
09/09/2015 Meron http://www.guitarforum.co.za/setup-mods-and-repair/hofner-bass-restoration-questions!/
12/12/2013 G-Man http://www.guitarforum.co.za/setup-mods-and-repair/bass-guitar-rebuild/
Mod
13/5/2016 Peter http://www.guitarforum.co.za/setup-mods-and-repair/electrifying-my-guitalele/
06/12/2015 Meron http://www.guitarforum.co.za/setup-mods-and-repair/project-pimp-o-caster/15/
Amps
Build
09/10/2015 ez http://www.guitarforum.co.za/amps-speakers-and-valves/i'm-building-an-amp-with-big-bottles/
07/12/2012 ez http://www.guitarforum.co.za/amps-speakers-and-valves/new-%28f3nd3r%29-amp-kit-day!/
06/04/2011 ez http://www.guitarforum.co.za/amps-speakers-and-valves/one-small-step-at-a-time-or-my-18-watt-marshall-build/
Repair/Refurb
Mod