Re: tree on outboard
Ugh. That's rotten luck.
Better check to confirm that the transom clamp is OK. If the motor was on the boat, and it was bashed hard enough to bust through both the cowl and the recoil, it may have cracked the clamp as well. Maybe homeowners will cover the damage...
New parts won't be cheap. For example, I have sold replacement cowls for these, and they [alone] are pricey at MSRP. BTW, if memory serves, oddly, the Nissan-branded cowl is cheaper than the [identical] Tohatsu cowl for the 9.8. I would do an assessment of all the parts you are going to need, and see what pricing you find. If buying new stuff (likely, as these motors are fairly recent, and there's not a lot of used stuff on the market), the cost is going to be way up in the hundreds. If a cast-in lug (cast into the head or block) for the recoil is snapped off, you should consider that you technically have a damaged powerhead -- with a cracked crankcase casting, for example.
One possible way to go would be to find a unit with a blown powerhead or trashed LU, and transfer everything you need, as mentioned before. Since you are into the off-season, you have the luxury of time to look for a used motor as a parts donor. Good luck to you.