Four kind of details to build a board for your effects. Ready for experiments!

Models can be printed with no brim, no supports (at least with PLA). Try to twist screws in nuts once before build a board to smooth the roughness.

Use two screws + nuts to connect two modules through round holes or to attach a handle.

Use holes to mount pedals with cable ties or use hook-n-loop tape. Use free holes to organize communication.

FreeCAD project made on v1.0 branch and uses additional Fasteners Workbench.

The pedalboard had been totally inspired by Modular Guitar Pedal Board by @Vioppoiv. Key differences are:

• Uniform grid of holes both for cables and cable ties.
• Handles can be placed between two modules.
• Side bores for cables.
• No legs. Ribs to make surface durable.
• Side ribs to make a long board more durable. 

Known drawbacks:

• Clamps may shift in big holes.

So why the model is not marked as a remix? Reasons are:

1. The model is under CC0 which is not possible for remix. 
2. Files had been made from scratch. Only general module sizes and a brilliant idea was reused.
3. Permission had been inquired.