Well bill I'll be eighty in January! I still can remember my "horny" times! LOL
I just don't see the need for such to advertise a bass amp. Besides which the amp I use is capable of 2000W. LOL
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Why do adverts such as the one above have to use crudity. It certainly put me off from interest in SWR products and I'm sure there must be more of us of the same mind. 🤯
If you are going to pick up an extension cabinet you would be better off buying a 4Ω box for the sake of power distribution. You may very well discover that the new 8Ω box adds very little to your overall sound.
Using a power amp in your system is a whole new ball o' wax. You have to take into account the input impedance of the power amp and the output impedance of the pre-amp. Typically the output impedance of the pre should be far lower than the impedance of the power amp. This usually directs you to a proper rack mount pre-amp and not a pedal.
I use a 2KW capable stereo power amp but I designed and built a tube pre-amp specially to drive it bearing in mind the factors mentioned above. Good luck!
I'm very familiar with SKB cases I have more than a few myself. I still feel the the added airflow from the front, read cool, would help with the longevity of the amplifier.
I found it interesting that you couldn't find a 4x12 cabinet in the UK. Before I left for Toronto in 1973 virtually everyone was using 4x12 cabinets. I owned a Marshal 4x12 with the 'bent' baffle. LOL who knew things had changed that much!! Enjoy the results of your efforts!