Custom Bassman amp

I recently bought a custom built Bassman that is modified and sound really good but the cabinet has some design flaws. The bottom speaker are angled up toward the player. He explaned to me that he intentionally made it this way so you could hear yourself better on the band stand. My thinking is perhaps the cabinet was just built to small. The gentleman that slod it to me is a friend and a great guy. I think all I have to do is swap out the cabinet. Here is the link to were you can see the amp.

Question: does any one have a cabinet I could buy for this amp. Thanks.

https://drive.google.com/folderview?id=1ZXLcG6mbnYyWU7OdqeQSSqtNu-mNMkFj