A pole barn perhaps. Rain is kept off but wind can pass through.We're getting to that sort of amount now, we'll use about 10 cubic meters (stacked) of mainly ash for a year of heating and a bit of cooking.
This is all our own wood and if I can sort out a sensible way of extracting it we could easily end up with 50 cube or more stored. Then seasoning will not be a problem but keeping the firewood in good condition will be more important.
Currently mulling over some designs for decent wood stores.
Removing one part of manual handling is paramount.
Mine; Arrival on articulated self load wagon, load trailer with mechanised equipment, take to processor, feed processor manually which then self loads bags/trailer on conveyor, move final produce to store & unload by hand, move produce to log-box by hand, feed fire.
Enjoy the heat
S