CTC A13 Bed Bracket / Adapter

I bought a cheap additional printer on eBay, and the description stated it had an aluminum heated bed. When it turned up I was surprised to find a miniature MK3 aluminum heat bed about 100mm x 100mm and 0.5mm thick Kapton tapped to the bottom of a black painted 2mm steel plate over 4 times the size, and also had variations in the surface of over 0.2mm which made it pretty much impossible to get a good first layer on a print except in about the 100mm square where the tiny little heat bed was underneath.

This was not going to work as a heated bed, so I bought a new aluminum bed which is a 214mm mk3. I did not account for the fitting of the bed on the A13 which I believe is the same as the Ender 3. The fittings are 117mm centered, not 209mm centered as the mk3 I bought.

So I drew up a small svg in InkScape to laser cut an adapter plate out of 3mm acrylic. The adapter then connects to the gantry on the A13, and then converts into a 209mm center spaced mounting.

I have also include