Frugal Horn XL and Mark Audio 11MS

Dear all,

I've just bought a pair of gold MA 11MS, and the plans for the FHXL.
I'm not good with wood working, so I've asked to a friend to built them for me.

Can these plans be used to save wood?
998601d1637241869t-frugel-horn-xl-alpair-10-3-10p-fostex-ff165wk-ce4e8da7-919c-4bae-8af5-713278504d93-jpg

source: https://www.diyaudio.com/forums/full-range/246248-frugel-horn-xl-alpair-10-3-10p-fostex-ff165wk-post6851878.html

I've decided to have it build it as is now, and then implement 390 mm wide suprabaffle ( http://www.frugal-horn.com/downloads/supraBaffle-appendix-draft.pdf ) and 390 mm wide deflector ( http://www.frugal-horn.com/downloads/stealthWoofer-0v8-200309.pdf ) later on to hear differencies.

It will be in birch plywood with surface waxing.

What is the amount of stuffing that I need to insert behind and below the speaker?