Yes, it's a very nice sketch from Jinx. The current ingame model which has balance issues is currently based off of it. Let's try to keep this thread on topic and focus on any new work brought to the table, unless Jinx decides to model a slightly fatter Geb or let someone fix the issues with the current model.
Having a closer look now at your tweaked model, some things come to my mind:
With all the antennas around the ship, it gives me the impression of being an oversized Resheph. Perhaps you get rid of some of them.
The radar dish is too big, I suggest to give it a smaller size and put it below the bridge, where you have that other antenna.
The "wings" or armor plates protecting that little antenna look like they were attached to the ship in the aftermath, instead of being integrated properly. From my point of view the Geb does not really need the wings at all.
The new belly below the bridge is actually quite nice. Just put the radar dish there instead if the antenna (s.a.)
Perhaps you increase the hexagonal armor plates at the engines or exchange them for some cover that is put at the sides as well as up and below the engines.
Besides that, Haste`s point regarding the textures still needs to be adressed.