Not too late at all, see the next post 🙂 Next task was to lay the templates onto the ply and draw around them ready to cut them out.     I held the template in place using masking tape and then drew around the outside. You should just be able to see in the bottom LH corner that I place the template on the plywood so that I have enough for an overlap on the top and bottom. I did this by taping a pencil and a piece of stiff wire to a 50mm wide piece of scrap wood. I also made sure I transferred the labelling from the template onto the wood, so that I would be able to identify the pieces and the correct orientation. Next job was to cut the ply.     Then I did a test fit of the rear piece, tp start to see how I was going to fix and shape it.     I decided I would glue and screw the ply to the side support (the one that the pice is clamped to in the image), and then glue and possibly also use some screws in the top and bottom, although the ply used for the top and bottom sections may not be thick enough. What I am unlcear of is how to hold the ply in place.          

Hello,   Do you intend the tonecontrol to move from a highpass of 1064 Hz to a lowpass of 234 Hz I have simulated the output filter and got this responce:   When I change some values, the attenuation is less:   I have used LTspice to draw the circuit and do the simulation: https://www.analog.com/en/resources/design-tools-and-calculators/ltspice-simulator.html   I have also attached the filter chapter from the TI book.   On the net there is also a design tool from Analog: https://tools.analog.com/en/filterwizard/   Bertus sloa088_Active Filter Design Techniques.pdf

I have an NSD, and the only time I tried to drive it, I got stuck inside. My own fault, I was unsupervised. My eldest kid drives it, and she finds it a tight fit. However, I have made the brave decision not to build a Paradigm. Or at least, that's what my wife tells me.   (I'm six foot two, my kid is about five eight, five nine.)

@Dougie C Thank you! It's not perfect, but I'm proud of how it came out. @Tobyskyward Thank you so much! I keep looking at and thinking about making a full figure from it... just don't think I have the space.   Also, thank you to everyone who Liked my post!!