"House of Joy" sub cabinet

Here ya go, lovely looking rig but my back has started to spasm at the very thought of moving it

Thanks for your responses guys! 

So I've done some extra searching, and found that the sub in the picture / link was not really called House of Joy. Turns out these subs I mentioned (king tubby's, sir Coxson's) were modeled after the Jensen Imperial. The apparent difference is that they seem to be a bit narrower until the last fold before the final horn expansion. Maybe better for the response below 50Hz? There's a thread on this forum from 2011, but all links are cooked. Thanks for the mention of Paul Axis, he has a beautiful rig, But those quad subs are more like the classic reflex boxes from the 60s. I've exchanged a bit with Paul, I purchased some equipment from valvatron last year, but thanks for the pointer, he's a vintage reggae sound expert, I'll send him a msg. Otherwise, what do think of the potential sound performance for this jensen-type box, if scaled for an 18" driver (PD1850) ? 

here a link to what the box looks like: https://ch.pinterest.com/pin/282530576619969871/

Cheers, and thanks again for taking the time :)

Personally wondering why anyone would want to build these back breakers in this day and age, considering what can be achieved, bang per puck, with smaller 1x21" cabs, with neo drivers, and the "right amplifiers".

But for many, Reggae sound systems are a business first, hobby 2nd.

I learned from Indian DJs, the importance of the soundsystem being optimised to return every dollar possible.

Know an excellent Indian builder who used to be here, would take out 2x subs, 2x tops on sticks, 2x 40" TV screens  on stands, and 2x flaming cloth thingies, and he'd be getting paid £1K for that Indian wedding gig.

All of that lot fit in Transit SWB, doddle to move with ramp, permitted in any posh hotel or corp venue.

Thanks for the responses guys!

As far as my objectives, well, it's a passion. I have a job I love on the side, which finances sound system construction, and vinyl collection. So no, I am not looking at maximizing return, or anything like that. I'm just looking to make authentic old school boxes, for 60s/70s ska, roots, rocksteady & lover's rock, and still have them sound as good as possible with what we know today. Lets the analog amps be heavy, let the old boxes be heavy, I don't mind suffering a bit, it'll keep me in shape. But back to the topic at hand:

@eyeT

"I think squeezing an 18" into the simplified version, where the throat starts above the driver, would probably be easier." is there enough space to squeeze an 18" in a half (single driver)-Jensen? If it doesn't quite fit, is it possible to widen the horn path by a few mm without altering the sound too much? else what about scaling the box to 18" was wondering if that might make more sense (aside from it being heavier ).

You also said "slightly narrowed throat" do you mean the last part before the final horn expansion? by how much, do I just eyeball it to make it look like Tubby's or is there a formula of some kind I can play around with?

Cool to know about India ! In japan and the UK they've made a few as well which seem to deliver :)

Thanks again for your time.

bless up---