Those kits have a long, sordid history. The rights to SF3d (The Japanese game these models were based on) were disputed for years between Hobby Japan magazine and one or two other holders. In the mean time, the kits were out of production while the legal issues were resolved. When the kits were able to be made again, Nitto started production, but then went out of business.
I think someone else has the kits now, although they are somewhat scarce. I sold some Nitto reissue kits on eBay and they generated a lot of interest.
Some additional kits are available in resin from various companies. Some are quite large. There is a big Nutrocker hover tank in scale wiht the 1/20 scale suits (Nittos's tank was 1/72) and also some suits in big scales.
Bandai has some new 1/5 Gundam stuff that is very similar with soldiers, hovertanks, small equipment, etc.
Also, Dust models makes some 1/5 Sci-Fi Germans that are in the same vein.
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