The GTHL1 mechanical design uses standard 19" layout, so that it fits standard racks.
It has standard 19" width and 3 times 3 units height, i.e. each crate is 3 units high. Each unit/crate follows the standard front layout for Euroboards. However, the modules themselves are not Euroboards but are rather more shallow.
Home
Projects
UBZR1 Synthesizer
GTHL1 Mechanics