I believe most of the 1U stuff you've picked is in the 1U Intellijel format. So as long as your case is Intellijel, you're good.
However the RE Guillotine is not in the Intellijel format. It's not going to fit in an Intellijel rack.
-- Ronin1973
Happy to correct you! https://www.ritualelectronics.com/products/1u-blank-panel-4hp
The whole line is Intellijel format.
Nkozi