I would not put a up my house for a timeshare just to risky if something happens but thats just me.You know your situation better then me but in todays unstable job market it would be better for them to take back my points then take my home for the same thing.
I think the minimum is 10% - with a higher interest rate (I don't know the rate at that minimum, but was told the 10% was the minimum yesterday by a DVC guide).
Timeshares, in general, have not attracted the best mortgage rates compared to a normal home mortgage , but Disney's rate is definitely competitive with those usually available for timeshares since they do control the ability to use the property.
You can certainly also check with your local bank to see what they would have available- most likely it would be tied to your home mortgage either as a 2nd mortgage or Home Equity acccount.
As with anything, its best to investigate all of your options.
Currently, it is 10% down based on the price before incentive. In other words 150 points at $101 each = $15150 so down payment would be $1515 and then you would deduct the incentive.
Current prefered interest rate is 10.75% for 10 years if you use direct debit as the payment method. You have the choice of having the payments due on the 1st or 15th of each month. The interest can go up to 11.75% if direct debit is not used.
I would assume that the prefered interest rate is based soley on credit score but I don't know what it would need to be to qualify.