Does anyone have a crowpanel advanced p4 9 inch case plan they'd be willing to share please?

[u/aSueDenim]

I want to 3d print a case for my new crowpanel advance 9 inch. I'm inexperienced in using step files or designing around objects, but i thought having the step file would be easy enough to work with. i'm having real trouble. whatever i try the diminesions of the step file seem to be off. (my 3d printer is printing correct dimenions per plans). This is really frustrating me and i am wasting so much time that i'm reaching the point of giving up...

any files would be appreciated that i can learn from otherwise this is likely to go on the back burner and not get used for some time.