DIY Speaker Kits, a good idea?

@duramax747 stated "  We made some Panzerholz versions of this cabinet in which we pinned (doweled) which makes it much easier for enduser to keep square while they glue/clamp up. "

Now you are in the area for Materials Selected where Kaiser Speakers are with producing Cabinet Construction.

Please let more be known if you have seen differences in the quality of End Sound through adopting this material type. 

https://www.monoandstereo.com/interview-with-rainer-weber-of-kaiser-acoustics/

I myself am very tempted to use P'holz at some point as a Baffle for a Speaker Design.

I have gone this route and built what I think are pretty darn good speakers using Dayton Audio and Morel components, and a professionally designed crossover, but now I want something new and they are nearly impossible to sell, even for a fraction of my outlay. So there’s that. 

If you have the necessary equipment, the space to do the work, and the will to learn because as in all new endeavors there is a learning curve absolutely go for it. 
 

For my beginner DIY speakers I took a very easy rout to convince me I could build something I like and also to experiment. Purchased some full range single speakers (TangBand W8-1808 $850 msp,, purchased used for $400, no complicated x-over), researched there ideal box size/volume. Found a pair of vintage Noresco speakers whose size matched the ideal size and are also made of 3/4" ply, no pressboard).  Beefed-up the walls to 1" thick, braced inside, mounted extra 3/4" front baffle (now total 1 1/2" thick front baffle). Installed the speakers and wired up. 

WOW,, I am sold on single driver full range cross-overless design. Wider and higher soundstage, highs are natural and right there, and the mid's steel the show... blah blah blah..

Only downside is bass. None, just none. But I have dual SVS SB1000 pro subs and the two together are wildly good. No concert level volume, these are only 8" and they are doing it all out of one voice coil. Up to 75db 80 db they are awesome. Jazz, ambient, electronic really shine. They even have me looking left and right. If I close my eyes I can see the music coming out of the walls. It''s crazy.

Blah Blah,, Blah Blah

There's always satisfaction to be had doing something with our hands. We don't have to design crossovers or fine-craft enclosures out of raw materials; just assembling a kit is satisfying, As some folks remarked, you feel closer to your gear when you have skin in the game (I paraphrase). Feels that way when I repair broken gear too.

About resale value... it depends. A pair of big Linkwitz showed up on craigslist a few months back. Very good looking DIY build, the guy was a woodworker, but it had an older driver set. Asking $3.5K if I recall. Just in the time it took me to ponder whether they would be a significant enough improvement over my current speakers, they were gone. Meanwhile, brand name speakers get reposted over for months at a time.