Slow progress last night - only got 4 side (370mm wide) panels cut from 2 sheets. But on balance I think I'll stick with this class. Has a new tutor who is a qualified cabinetmaker and already pointed out a couple of things. The warps in the panels apparently should not be a problem.
I had these 2.4m x 600mm sheets each cut down the middle into 1.2m wide sheets that was to get them into the car - and its in doing that that I am now working with the width of each sheet and it's warp rather than the length.? Apparently I should have done that differently.

Warp should be OK when glued up, I wouldn't be concerned.
Unless tutor has any concerns!

DarkLantern blog - darklanternforowen.wordpress.com

The design sketches:

DarkLantern blog - darklanternforowen.wordpress.com

Reading your story with interest. I think I’m going to do something like this as well soon...

AMR-iFi R&D

The MH-audio.nl design is a combo of TQWP, Transmission Line & Reflex, the website says.

In discussion with Rob, we decided to build the bottom venting more in keeping with the Paul Voigt's tapered quarter wavelength concept - ie. ditch the tuned vent tube & enlarge the vent.

This Speaker Builder article by David Weems is informative - Experiments with Tapered Pipes.

Voigt's innovation was to place the driver at the 1/3 low pressure node & to taper resonant pipe, so that the LF resonance ends up being spread over a broader octave & a half of bass.

DarkLantern blog - darklanternforowen.wordpress.com

The bottom vent options:

Side venting is a compromise between front or rear-facing bass port & gives options for either inward or outward-facing ports.
Also rear wall reinforcement might be less critical & side wall reinforcement could be adjusted if room placement dictates.

DarkLantern blog - darklanternforowen.wordpress.com