Found a ferret

I have just found a ferret in my backyard.  My 4 dachshunds were on the verge
of doing what they were bred to do!

I want to know if this sounds like a plan:
I now have it in a small pet carrier inside a sweatshirt sleeve.  Bought a
water bottle and some ferret FortiDiet Kaytee brand.
I do have a large training crate.  It is probably intended for up to 30-40lb
dog, about 30in tall and 4x2ft.  The thing is I am in the middle of major house
redo and its 'back yonder'.  It will take me a day to reclaim it.

I have no litter box, much less litter.  I am thinking of shredding some
newspaper for it to go in.  I have lots of different sizes of Rubbermaid
containers to use as a box.  

I will go to the homes in the vicinity of my backyard to see if someone lost it
accidentally.  I am concerned that it might be reclaimed by someone who let it
loose intentionally.  Had that happen before with a Basenji pup.  Now there are
stray dogs that look half Basenji!

It is not out of the question that I would keep it.  How do they do with small
dogs if  trained to not maul it?  I cannot afford much more investment right
now.  How much do ferret vaccinations cost?  Is the large crate I described
suitable?

I am frazzled with my home and 4 dogs now.  I just want the best for it.
Lisa