The information I know is that the fellow who made the "Space" 'Mags was French machinist, living in, of course, France, and the 'newest' version he'd made was shortly after the RTs first came out, which would have been about '96. There were three, total, near as I can tell- one off custom-built pieces, the fellow made them for himself, not as "production".
I have not seen a new photo since spotting the RT-based one probably in '98, so I strongly suspect the machinist either quit playing, or doesn't speak English and so doesn't visit our same circles online, or perhaps he got hired on to some place like WDP or Eclipse and hasn't even thought about milling a 'Mag in eight years. Don't know, can only guess.
I made a SpaceMag copy about three or four years ago. The "original" style- it was slightly changed over the French fellow's design (among others I flattened the base of the grip to allow a tank or stock to be mounted like usual, and I didn't use the internal air connections) but I tried to recreate it as closely as I could. It was based off a standard 'Mag upper, rail and valve at the time- this was pre-L10.
What pisses me off is that I managed to not get a single photo of it completed, and I haven't seen nor heard of or about it since. I was typically late in finishing it, as can only guess the customer was unhappy with the wait.
However, I have two more rough grip blanks of the correct shape- I had a water-jet shop cut the blanks from plate, which saved me probably eight hours of just rough milling. The bar I had on hand was big enough for three, so I figured what the heck, and thought about making more than one.
However, not having a CNC, the body profiling was largely handwork, using air-tool burrs and body sanders. I thought it came out well, but took a LOT of time and materials. Doing one was a pain, doing three would have been a major undertaking.
Now that you got me thinking about it, I have a boxful of old 'Mag parts, including an L10 kit I've never used, a partially-milled Sluggo body, an old Benchmark frame, a rail and a sear... Want me to build you an updated SpaceMag?
Doc.