Actually, if you look at several of those images, they are dated in the bottom left for 1992, the same year Battletech tried (and failed) to be successful in Japan. Interestingly, info on it is hard to find (I know Sarna has an entry on it somewhere. They have the images after all), but this quote confirms the date for this failed foray,
Quote
A Japanese edition of BattleTech was licensed by FASA in 1992[17][18]; it had new artwork provided by Studio Nue[19].
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http://knowyourmeme....ures/battletech
So, your initial understanding was correct.
Battletech was made first in the US in 1984 and boosted designs from a few animes from the early 80s. The designs you linked were made in 1992... and thankfully forgotten and buried in a deep dark hole.
edit:
Seriously. I think the designs Tactics used are better than these... things. And I loathe what Tactics churned out.
Edited by Cerulean Knight, 22 October 2015 - 02:36 PM.