"I don't think so, not a fan of down facing subs."
I've found that ugly woofers are more esthetically pleasing when they are down facing.
"Not working" is a pretty broad description. As @musicfan2349 suggests, refoam kits are very reasonable and CAN be a DYI project if you have a little patience. If you have a non-working amp, you can send it off for repairs. Can't imagine this being north of $200, including shipping. (We fix old stuff. Not looking for additional work, but just a thought on repair costs). If it's not powering up, you might look for a blown fuse?
Sentimental value? Who can forget "It's so fine, my VEL-O-DYNE?"