To play Devil's Advocate for a moment. You need to factor in that while the rig is down, the tangs & such bear inspecting. And if you find enough things that you don't like, then you need to pull off everything. Spreaders, tang bolts, masthead fittings, et all. Then check them with dye penetrant, & a magnifier, etc.
Also, while the rig's down it's wise to add an extra run of
wiring or two up to the masthead & spreaders. So that when you want to add anything up there down the road, you don't need to drop the mast again in order to run the
wiring.
The same is true regarding adding an extra sheave box, & or a tang or nose for a spare inner forestay, should you choose to add one in the future.
Plus, if you run into any glitches, the time required can spiral upwards quite quickly. Such as if there are any issues with the
furler, etc.
When it comes to figuring the fiscal talley, if you know what components you need, & how much wire, it's simple enough to go to the Rigging &
Hardware website, & add up the cost of everything. That part's fairly simple.