Dual Showman Cab Tittification?

[wallyp]

Hello All

Purchased this beast from a shop that was closing down for the princley sum of £15. Nearly put my back out loading it into a pickup.

I bought the top speaker, an Eminence DELTALITE II 2515 NEO 8ohm 15" 300watt as the original was ripped.

I have a Dual Showman Reverb and a Fender J Bass I'd like to use with it. Mostly neck pickup with tone off.

 

My question, as a complete newbie to cabinet design, is can I get this to a useable state? And what should I be priortising? Its looks like somebody has closed a couple of the front open 'ports'. Should I be closing the rest off? Closed back? Acoustic matting? Create new ports? Seperate the two speakers with baffles? 

 

BTW low G to Open E farts like a good un.