If you were to use a fully straight transmission line, the whole thing would fit in 72cm(wide)*21cm(deep)*169cm(tall) assuming 3/4″ mdf. True it’s pretty massive, but mostly in height which is good for taking up a small footprint. The MDF box portion is only 72*72*21. The box could probably be shrunk quite a bit in depth and height (72cm parts), but I’d have to see how that affects absorption. Good thing about transmission lines is you get the benefits of ported and sealed. Downside is size.