There are lots of information and experiments done, and there are two designs on the first page that are kind of stable. I built the smaller one cause I felt that I don't need the bypass switching and the resistive load options, and it's pretty simple. Volume is not really an issue anymore, I can even reduce the volume to bedroom level (though it does not sound good, cause the speakers are not really moving air how it supposed to). If you guys need lower volume, I think this is an easy build to do - thought some people would be interested in this here.
The -3.5dB step is missing from my build, I do not need that much switching options, so I omitted it from my build, you can easily do that too.
If you are comparing chassis/kits designed to use the original layout then the instructions would be interchangeable.
Mojotone is great I recommend them without hesitation. I have bought similar chassis from Mojotone and Weber, and to me Mojotone seems a little more vintage accurate. Weber makes fantastic speakers but their amp kits come with very cheap components.
Since you have a lot of experience it should be relatively easy but very fun and rewarding
Let us know if you have any questions, I absolutely love this stuff and am excited to talk about it
Yeah, I had the same issue, cause I didn't know much about coil brands, or types, what to get, where to get it, etc...
The easier thing is to go to your local electronic parts distributor and get an air-core coil with the right values. The wire diameter should be somewhere around 1mm and the DC resistance as low as you can get.