The actual Planning Ahead part is and has been in the terms of years.
I have over 200 builds planned out, some have been that way for a couple of years, and some just got all "planned", but, won't be started for a long time.
Unless something comes along to move a model up to Now,,,,,,the next one that gets started is just the one in the pile of "ready to go" kits that attracts my eye on the day that I am rifling through the resource sheets looking for one to start.
I started the resource sheets because before, I would get all enthused about a build, dig out the kit, the decals, the paint colors, the armament,,,,,,,,and find some one thing wasn't here yet to go with it.
Now I only look at models that have everything in stock when I make my choice. Whenever I get more supplies or weapons kits, or a decal sheet, more models get finished resource sheets,,,,,,they join the pile on the day I pick out the next project to start.
Rex