thomaspicton wrote:I do intend to find a museum home for them
It seems like you missed the finest hour for this: the 200th anniversary of Waterloo. Because of that, in Belgium and The Netherlands some huge, surprising Waterloo diorama's popped up during 2015 in some of the greater history museums. One was at the Hermitage Museum in Amsterdam. Another in Liege which was four large tables in four different rooms. These were all only temporary though. But I have no idea about the situation in England.
thomaspicton wrote: if I leave it too late, it could be that I never get to see the fruits of my labours. Advice please!
With a huge mass of figures like you have, it will not be easy to find a place to expose them permanently. But you have to find that place yourself while alive and don't pass that quest through to your wife or children after your death. Your family will probably pay respect to your work but they will have other important concerns in life themselves. So I advice you to accept any temporary or permanent possibility. As soon as there's a plan where to expose your work, it will give you a focus on improving it, the bases of the figures, the landscape, the composition etc.
thomaspicton wrote:My dilemma is that if I let this happen too soon, what will I do for the rest of my life?
That should not be a problem at all. Start another collection. From another battle. Another period in history. Or may be a smaller project in which you pay attention to the quality in stead of quantity. That may seem less exciting to you. But I can tell you from my own experience (after painting 3500 Napoleonics in very simple, basic colors only) it was refreshing to start doing ancients in much smaller numbers but much higher quality.