I have seen the light and it is hard, metal and clanky. I was trawling the forums, as I quite often do and I found something absolutely beautiful. Here is what I am talking about:
The miniature is available from Studio McVey and comes with different arm kits and each one comes with an open and closed cockpit for a bit of customisation. The walkers are £21-99 and the arm sets are £1-99 and although they are quite expensive, they would make excellent tunnel fighters, spaceship boarding-parties, loading dock MHE or even special characters in a mercenary army.
I really like them and think that there is enough room in the torso for a seated Grymn...so maybe...
See you after visiting the bank manager!