Bandai announced a Gosaurer model kit is already in the works and we have first hand images that was posted online.

In the official Bandai Hobby Spirits Development Blog posted the first prototype images of Gosaurer which is currently in development. Judging from the images, the figure is big probably almost in height as a regular Master Grade scale Gunpla, but slight taller to a regular HG scale.

I speculate they're trying to make in-scale with the 1/144 scale Gunpla kits, but I could be wrong and I might also speculate they're making this kit non-scale. In keeping the figure show accurate, the development team tries using previously released guidebooks and artbooks and mecha illustrations that were used in the anime as source materials. Hope we get more info on this recent development in the coming months.

Nekketsu Saikyo Gosaurer is the third and final series of the Eldoran (aka Eldran) trilogy alongside Zettai Muteki Raijin-Oh, and Genki Bakuhatsu Gambaruger which ran from 1993 to 1994. The Blu-Ray version of the series was recently released last May as part of the series' 25th anniversary celebration.