Partial hi-jack but still along the lines of this thread ...

That big empty container - the back carrier without gears - bugs me. Holds oil as mentioned more than once, for no reason other than it is there. I've been contemplating filling that box with expanding urethane foam (two part mix type), some of which I've read is gasoline, oil impervious (or at least resistant). Seems like a reasonable way to end worries about oil slopping back there and not getting back to the main casing quickly.

Thoughts anyone ?