Ebike conversion kit - Controller Housing

I converted my old mountain bike into an ebike and wanted to build a nice and sleek housing for the motor controller. This is the bike I used: https://www.walmart.com/ip/Hyper-Bicycles-26in-Men-s-Havoc-Mountain-Bike-Black/102003163 This is the ebike conversion kit I used - Mine was a 500W rear hub motor: https://www.ebay.com/itm/322247604604?ul_noapp=true I also added a kill switch for emergencies. All parts use M4 screws and nuts to attach to each other.