I've been working on this off and on for a while now. I'm slack so progress is slow
I decided to make my own board and went magnetic with larger tiles to allow for 25mm slotta bases and a bit more breathing space than the original had. Rolls of sticky-back fridge magnet are dirt cheap, so pretty inexpensive. A bit of Photoshop/Illustrator and some cutting/spraymount later...

I added a 'background' board that is a few squares larger than the original HQ board to allow monsters around the edges and through the middle. Also some corridor sections for AHQ or WHQ...

So far so good. Then I realised I had no doors. These were my prototypes:

And here are the ones I created for a single part mould:


First castings in polyurethane painted up:
































