The 8 thrusters would be for more precise landings like on rough terrain, but if all four thrusters on one side were fired they would also create a roll effect...for that design the front part would need modified slightly to make room for the front pair. The landing struts would actually be about the size of that face, able to drop down then foldrotate out. That'd be alot of weight, but i'm not sure how to fit much more on the bottom of that as it is...the balace would be ok though with the weight of the cockpit and controls in the front, and the reactorengines in the back. I like the main thruster design, very cool and of course the rest of the model looks great.