Thanks dude. Yeah i guess the cannons are it's only weapons. Hadn't really thought about variants, until you brought it up of course I think the same, or similar chassis would look cool with some rocket launcher pods in place of the cannons and maybe up on the shoulders. Like a kind of mobile missile platform, as a opposed to a sentry type walker.
you're welcome. have you considered adding a chin turret under the cockpit ? since it is a sentry drone it should have some anti-infantry weaponry. as for the missiles, shoulder mounted ones would fit this chassis, arm mounted would look..odd, but it remains to you how do draw it