No belated questions! Only timely questions here :)

Since Wolfwood can carry his big cross gun, he could find it down here, BUT it isn't going to be in good shape. Big things don't tend to fare well in solid hot rock, so if he finds it, it'll be in several fairly worn pieces and will need to be mended somehow. Up to you how many, and it's definitely mendable so don't worry about it being unusable, but it won't be pretty.