I have made two young relatives my Executors and willed my model-engineering and caving-related possessions to the relevant clubs, save only any money from models to be for the Estate , as they are potentially more valuable than the tools and machines). I am preparing an instruction-sheet to accompany the Will, with names of societies and other useful details. (I've not mentioned how to move a Harrison L5 lathe and Myford VMC mill through a 2-foot doorway and across a lawn…)
In my own ME society it has become established now that when a member meets his own maker, one or two fellow-members act for the family in disposing of the workshop contents as best they can. Even If not raising a fortune it will still be a lot more than the clearance-firms will offer, and at least the family know the assets are going to people who will appreciate them (often, within the society).
This does not affect only model-engineering either. A number of Mendip Hills-based cavers have organised the Mendip Cave Registry Archive to collate and store for all manner of relevant, original literature (exploration histories, surveys, photos…) that would otherwise have been simply thrown away by uncomprehending relatives or house-clearers.