Zaphaudio ZD5 still worth it... MOD advice ...

Hi Folks
I am looking for a reference level speaker to build for a small room and I am interested in the Zaphaudio ZD5 floorstanding vented enclosure.
Since it is an old design and most of the info I find it's also old I wonder if it is still a good choice or I should be considering other options.
I also checked the Troels Revelator-51 and Ellam 9800 but I am not sure if the bass response is on pair to ZD5.
Please, I would appreciate some advice!

If I decide to build the ZD5 I would like to make the enclosure less deep using part of the sand filled chamber at the bottom. Total volume and front baffle would remain unchanged. Approximately something like this:

Internal dimensions inch(cm): Width x Deep x Height
ORIGINAL: 5.5(13.97) x 12(30.48) x 23(58.42)
MOD: 5.5(13.97) x 9(22.86) x 30.5(77.5)

Is this a bad idea? Other dimensions would work better? Port can remain in the same position?
I read that lots of additional damping will be required at the bottom
Please I need guidance from expert guys!! Thanks!!
 
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Sounds good. It is by all accounts a competent design.

Your plan to reduce the depth seems OK. John mentions it in a way that seems non-critical, but stresses that you should damp the longer dimension all the same.