New cabinet for L200

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holy cow, here it is

http://www.audioheritage.org/vbullet...300+dimensions

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nice.
Practicality will rule the day and mine will prob look like that

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I am going to go the full whack to convert this to L300/4333.
I will need longer horns for the LE 85.
The H 92 horns are not easy to get and are quite expensive.
I am considering getting Smith horns / JBL 2397 cloned.
Would really appreciate help with regard to the dimensions of the correct horn to get the frequency response down to 850 Hz.
I have seen descriptions of some nice horns but the appropriate length of throat does not seem to have been addressed.
I see some wooden horns applied directly or very close to the drivers, but perhaps they are trying to achieve H 91 type of length.
Appreciate help here. Thank you.