I bought this at the Horus Heresy weekender 2017, and in a fit of building actually have it ready for undercoating. The build was frustrating, particularly because a couple of parts were missing. Fortunately, I have a Legion Glaive for my Alpha Legion in bits, so I robbed them from this kit.
I'm gluing the sponsons in place. After building and painting my Alpha Legion Sicaran, I think resin kits are too delicate to have moving sponsons.
I have placed a crew figure in the open top hatch. I can see a large tank like this sitting back with the commander sticking his head out to keep an eye on the wider battlefield, both to pick targets and all the while ensuring he is not enveloped in a counter attack. To fit the crewman in, I had to carefully trim and file the models arm down a bit on each sides. This was done slowly and carefully to ensure a tight fit.
The long hobby war continues...