Hi,
I am too in process of building a kossel mini delta with injection molded corners (from aliexpress). Just assembled the base triangle and I find the space is pretty less for the electronics to fit in ( I will be using MKS sbase 32-bit board btw). To fit all electronics (including the power supply) and give a printer a cleaner look I have started building a box like structure made of Plywood (20mm thick) which was a leftover of another project ( box size 400mm x 330mm) over which the printer will sit and all electronics inside it. Finally planning to throw in some 80mm fans for cooling inside the box. May be, you might want to consider such a workaround in your case.
Cheers,
Arvind