Back to the Future Hoverboard Components

This is an adaptation of Imirnman's wonderful Back to the Future Hoverboard model from thingiverse (https://www.thingiverse.com/thing:1750752) I have excised the board itself as it's honestly easier to construct your own blank from foam, foamcore, mdf etc. Dimensions and methods can be found all over the web (I highly recommend hitting up the RPF and also searching out the two YouTube videos by Dustin McLean, once of DIY PropShop).What I'd been after was a convenient way to make the underside ha