Tannoy Churchill crossover

After reading Jeff Day’s experience upgrading his Tannoy Westminister crossovers, I’m thinking of embarking on a crossover upgrade on my Churchill’s. These speakers are pushing 20 y/o now. They are an early fist version with serial numbers in the low 020’s, with the external wood matched crossover cabinet. (Not wide banders)

I’m hopeful someone has already done such a project on this specific speaker that I can get some learnings from. Might there be anyone out there that has accomplished this on the Tannoy Churchill?

sample pic of this model with external crossover cabinet:

http://tmraudio.com/product/undefined-1592

Insights are greatly appreciated!