Some reality thoughts:
Time / money. Both are needed in differing ratios to complete a project. The project needs to conform to the practical amount of time and money you have available. Plans made ignoring reality may eventually grind to an early demise.
I would encourage one to carefully consider the amount of time and money available to sustain interest in a long draining exercise which may exceed your patience.
When active building layouts I have had several folks show me cob web covered piles of half started layouts the went well beyond their financial or physical ability.
Mother said it best: "Don't bite off more than you can chew".
I purchased a large basement (with a house above) and downsized my layout plans three times as I pushed my age against my resources and divided by age related diminished patience.
Less can really be more (fun) in the long run.
Even my present "less" sometimes looks like I am trying to swallow a mouth full.
Downsizing and confining purchases to swap meets could save a lot of aggravation.