TPQWR for a 10" driver (Circlomanen?)

Hi so I've got a number of 10" drivers available to me at the moment and I'm trying to decide on the best boxes to build for them. The intended purpose is to replace the current reflex subs I'm using for my function band (Thomann Pyrit 12A - 96 litres) with something a little more efficient and just because I'm interested in building some subs with the drivers that I have and seeing what you can get out of a small box with a small driver. So really the criteria is as small as possible and as efficient as possible. 50Hz-160Hz ish. 40Hz is probably unattainable without an excessively large box and I can always build some THAM15 or ROAR/Paraflex for some 15s I have lying around if I need something bigger. The portability and weight factor is a fairly big thing because I need to transport in a Vauxhall/Opel Zafira Tourer the entire PA plus my keyboard rig.

My initial thoughts were for something like double THAM 10s which seem quite driver flexible and are around 120 litres. However after seeing the ROAR designs and in particular something Circlomanen designed on Martinsson's website I'm keen to get some more information about it and similar projects. I've posted the file here, I gather it hasn't been built but I know Circlomanen has built other similar boxes. Have posted the drawing for clarity.

Any assistance welcomed.

Thanks
 

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