[Newbie] Help assembling the model

[Roberts_Clif]

I too did this following tutorials and Printer this Snap together case.

New Case Layout.jpg

I created both parts and using Fusion 360 these part are created in the same layout though they are separate from one another.
I can use one model to help me shape the other model. thereby allowing me to size and correctly postilion parts.

I designed my Case from known specs like per-positioned standoffs and size of circuit PCB.
Then I searched many tutorials to learn how to accomplish each and every single step of the process until completion.

Blue Case.jpg

I should have added the Fan Screw Holes, As you can see on this case I drilled them incorrectly.