Looks good, Gogg. It's great to be able to design your own case.
Just a few suggestions:
On the design layout, it's customary to have the down watts on the left and the up watts on the right.
If you're going to put 2 1000mAh lipo batts one on top of the other and also add a horn style switch that has about a 1/2" depth on top of the batts, you'll need at least an internal depth of 28mm - 30mm.
When stacking the batts and components one on top of the other, you only need an internal width of the flat lipo + a mm more for ease of fit.
The size of the 1000mAh batts you've chosen are a bit large for that mAh. You can buy Walkera or Storm single cell lipo 1200mAh 25C and the width and height are smaller than the 1000mAh Turnigy.
Those cheap horn buttons at madvapes don't hold up well and madvapes never had a stainless steel horn switch, only a chrome plated one. If you're looking for a quality horn type switch that goes the distance, try the E-switch 12mm high profile ones. They come in an assortment of colors plus stainless steel:
PV5 series E-Switch
shopping MV is fairly futile, any more.
Madvapes used to be the goto place for modders. Not anymore with the constant out of stock parts and not responding to queries about when stock will be back in. It's frustrating and has led me on searches to buy parts elsewhere as well as trying to find a good deal on the price.