>>23314058
>Is it even possible to do so without having to go into Mobile Armor/Big Zam/Destroy Gundam territory?

Not really common, so usually yeah, mobile armor territory. Here's the Deep Striker, a version of the S Gundam fitted with a beam cannon taken from an Irish class battlecruiser's main gun turret. I'm pretty sure it doesn't have legs anymore, they seem to have been replaced by an assortment of thrusters and propellant tanks. I think I recall someone calling it a "thrusterfuck" as opposed to just being a clusterfuck of parts.