Outer shell

Hi everyone,

for a prototyping project I would need your help on how to make the body.
the object in question is a portable analyzer. the objects inside it are those you see in the image and in the STEP file.
as an idea I thought of a solution similar to the "gun" (see attachment)
do you have better ideas?

Thank you all

(link to the STEP file) https://we.tl/t-7GgprZc68k