Spad Electronics makes an awesome Kastle available here:

https://www.etsy.com/listing/898601719/diy-digital-lab-kit-kastle-bastl-mini?ref=shop_home_active_5

its cool, so i made a case for it. It holds your Kastle, the 9v battery, and some dupont wires. all in one nice tidy 8-bit package.

Your synth is in another Kastle!

(THIS IS NOT FOR THE BASTL VERSION, re-read the description before commenting.)

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clean up is all you need to do.

in terms of assembly, put the battery in first, wrap the velcro arround it, plug battery in. later on once you have the velcro in place, swapping batteries is easy, you dont need to open it up, just loosen velcro swap and close up

place kastle in, and route the wire as you lower it down on the pegs. if you route the wire correctly it will sit nice and flush with out needing to be held down.

now, on the lid, make sure the slots for the hatch are clean and clear. clean up the pegs on the hatch, slot the hatch in to the lid.

put a dot of glue ( dont use alot so its easy to take out ) on the top corner pegs, and the raised tabs on the bottom tray, then lower the lid/hatch set down.

get a set of calipers and Fusion 360. measure. make.