What's the polycount? (i do not know if it is low-poly-enough for glest)
The details are made in the texture., so that is no problem.
But I think i would be better to show the models, when they are textured.
90% of the models visual power makes texturing.
And it also takes the most time. The basic "model"" like that takes time of 5 - 50 mintes((people with good skill maybe 1-2 minutes...). So please show it textured, because texture makes geometry to a model.
The geometry I see looks good(but maybe there isn't much to make wrong with a tank so lowpoly

).
I can't wait for more details!
Greetings,