Probably should add that my budget in pointing towards a moderate price.
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Though not a proper response to your question, you might be interested in this restoration:
And this guy might be able to assist you:
Sounds like a fun project. Good Luck!
Parts Express will have everything you need. You can also call and talk with a tech who can help make sure everything fits, guide you with crossovers and connections, etc.
Part of the charm of these things is the sound. I wouldn't try too hard to modernize it. Find some drivers that fit, hook em up, maybe stuff a little filling in there, bet you are happy with the results. Kinda like to have one of these myself but finding the right one never quite worked out.