That'd work, but it would be cheaper to track down the Alpha Strike Fire Lance pack, with it's plastic Shogun. Some out there for around $10 online. The Shogun C is plastic, the other Shogun is metal, and - other than the leg stance - you'd be hard to pick the difference. Plus you get a Trebuchet, Dervish, and Stalker!
Edit - just checked out the Orochi at IWM. Just push the torso back a little - you see the Shogun doesn't overhang much - and it's a terrific base!
W.