Let's split keyboard case - middle piece

I snagged a couple of [these cases](https://stratakb.com/store/cases/lets-split-standard-cases) but being the miser I am spent 2 hours creating a middle skirt piece rather than buy the full case. This was one of my first projects with fusion 360 and I think it came out really well.

I used these for a couple let's splits with [hot swappable pro micro slots](https://spacecat.design/products/pro-micro-dip-adapter-24pin?_pos=2&_sid=16acffc95&_ss=r), so this middle piece requires [5mm spacers](https://www.amazon.com/gp/product/B00BWLQEHE/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1) be added to the already included spacers. I will get around to modifying and testing the design eventually, but if you want to print it without the spacers, you should be able to just knock 5mm off the caseDepth parameter in the fusion360 file and it should work just fine.