Overall, I think your Hetzer look great. The camo is excellent and is faded nicely. The machine gun on top adds a nice little colour break.
When assembling indy tracks, I use testors thin cement to hold the tracks together. I can literally build the whole run of tracks and still fold them around the idler and drive sprocket. Then I add more cement to hold them and let them settle over night. Letting them set longer will avoid the problem you have here of the seperating when bending.
As mentioned already, the uneven bottom run can easily look great when set on a simple base. Roll out some putty or clay and when almost set, place some thin cling film on it and then push your Hetzer lightly into the ground work. Leave it over night and then lift it off. Carefully remove the cling film. Your hetzer has no clay/putty stuck to it and will fit nicely back in place again. Weather up the tracks a little more with a light mud mixture, and strategically hide the tracks slip as seen on the back on both tracks!