In a recent issue of Hobby Japan one of the modellers re-did one of these old Geminass type models in the 'Gundam Love' series of refurbishings. Cannot remember which issue it was in but I remember being surprised at seeing it.
This is supposed to be a suit from the Gundam Wing universe but as you can see it doesn't really have many similar design traits with any of the 5 main suits, their upgrades or their Endless Waltz versions.
That said... I like this model a lot (The 01 on the shoulder indicates that he's the 'boss' of his scale, in this case, 1/144). I like the core design, especially the head. Relatively simple armament without all the extra crap attached to it. I think the proportions are good but it doesn't have a lot of articulation.
This model could use a severe paint job. Particularly those single molded feet. Yikes. The main reason why I like him is that he's a bit shorter than the rest of the 1/144's but he looks tough. He looks like a work horse, without the gimmicks or tricks but he's also got a couple of those too. The plain multi-purpose suits tend to get the 01 ranking with me.
Upgrade outline: Custom shoulders (simple), strip the fins from the legs, paint the whole thing (white, black, gunship grey, gun metal), seam lines, panel lines, putty the gaps in the rifle.
Rating: 7/10 (as a model but it ranks quite high as a personal favourite)