Yonks ago I did a DIY tower for my A1200, dropped the motherboard several times, soldered on an AT PSU header on flying leads for power, then dropped the whole case.. still fired up OK.
Timing and PCMCIA fixes to both A1200`s, where I learned not to catch a soldering iron if you drop it :pissed:
Built the multimedia keyboard adapter gizmo on aminet, and the PS2 mouse adapter to go with it.
4x20 LCD on the serial port using an off the shelf adapter.
Replaced the battery in my A4000 on flying leads, so it won`t ever leak on the mobo.
Parallel port mp3 player using a VS1001.. just a testbed for a clockport version.
A1200 1Mb flashrom, currently hacking away to try and get it to cold boot from a CD !