Some folks specializing in synth mods

Here are some wonderful pages of synth mods

9bit

audiodiwhy

Cykong

Circuitbenders.co.uk

Jacob Korn

Manfred Lipp

Semi-automatic

Stereoping

Tim Stinchombe

Robin Whittle

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Here are some DIY builder groups and individuals

“DIY builders for hire” thread on muffwiggler

Tubbutec’s Synth Techs list (international)

DSL-MAN

Klanggenerator

Tape Echo Heaven (super source for them old echos)