[nzwilliam]

Probably the best bet would be asking Cirx from SAS what he thinks about it as he has hands on knowledge of this type as there is one in the Johannesburg military museum. If he can't or doesn't want to make it himself he would have valuable insight, information and photo resources for someone interested in making one perhaps.

Took several photos of the one in Joburg in April this year when I visited the in-laws, here's a couple of them: