Ah, yes, the mod factor, totally forgot about that one. I don't think I'll try to do that at this stage: this is the first time I've run into a need to do so, which makes me think I'm unlikely to hit it again.
Was it worth it? Well, I was looking for a game to replace War of the Monsters
(the motion on it makes me sick) and this one, Rampage: Total Destruction
has some of the same features: destroy everything. It's not as cool as WOTM, but it's not making me sick so far, so I'll call it a moderate win.