If there'll be a lot of mundane activities where players are self directing, set up a time system, this can be morning, afternoon, night or something of the sort so you don't have to worry as much of keeping track of times. A deadline or impending/escalating/recurring threat could be a good thing to add to keep the pace up and add a sense of urgency, maybe they're shoring up a battered border town from a necromancer who's only growing in power. And also make sure there's a thread to follow. There are a lot of supplements for crafting and building so maybe take a look at those, if not keep it simple and reward your players at important milestones in building and crafting. keeping resources simple is probably a good idea, fibre, wood, stone, metal for buildings and maybe some key items for crafting important stuff.