There is no real "hall of fame" for outstanding members of various hobby communities. I wonder if there isn't anything in print that might support a Wikipedia article about the fellow (IAW their rules on notability?)
Perhaps a commemorative issue of MILITARY ARTIFACT might be in order, if there were enough stories about Mr. Ursual to share?
Not that I'd want to make work for my publisher or anything. I guess the hard part is to not look crass while financing such a venture. Just a suggestion. I never knew him but I certainly saw his auctions on ebay and was impressed by the photographs and range of the items offered, as well as the descriptions.