Nagaoka D-99 - 6N-FE88ES - Build Advice

Looking for some helpful advice on building these lesser known Nagaoka D-99 horns. I heard them in a record store when visiting Tokyo over the summer. The shop owner was kind enough to send photos of the plans, which are all in Japanese. I haven't been able to shake the idea of getting a pair for myself but there are some apparent challenges...

I am not a cabinet maker so I would probably want to contract someone to build the boxes for these. Finding one nearby (DC suburbs) that can decipher the photos I have seems unlikely. Anyone on here specialize in these types of projects or know someone who does?

In addition to the photos below, I also have a very clean PDF of the D-99 ES-R ver. II with adaptions for the FE108ESII driver. I'm guessing the [wiki=[wiki=Fostex FE108EZ]%[/wiki]]%[/wiki] would work too?
 

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You can get some help from the original construction projects and also get the text translation from Japanese to English.
Link
Also here (more pictures) link.
 

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