Some arrangements off the top of my head: An option to buy sometime between 18 weeks and a couple years (or whenever).  

I can arrange that by family loans.

Depending on your level of commitment and partnership and what you mean by JV in this case, I'd definitely be careful with anyone you just met and long term arrangements.

You as the Grantor (owner) of the trust are still in charge, and can easily do this arrangement by yourself.

Agreed with @Matthew Paul - I think your options to make the situation work better than it currently is working are:Negotiate with the seller to get a credit that offsets the value of repairs, although you almost certainly won't be able to get a credit for "nice to have" repairsPartner with someone to take on the initial $35k project costs and give them a slice of the cashflows (or whatever arrangement is mutually fair)Evaluate the cash on cash ROI if you hold on any non-essential improvements up front, and perhaps make them 5/10/15 years down the road.

How to divide my time and arrange things effici­ently?

This kind of arrangement can be a head ache with 1031 but with a flipping business it can be advantageous to consolidate your activities and provide going concern for finance purposes.You don't need a MA accountant but you do need an accountant familiar with MA.  

We need to arrange the stay as well.

If you are in escrow, which closes in 5 days, and have accepted a down payment, is it too late to arrange a 1031 exchange in California?

@Troy Gandee arranges quarterly networking events, you should check him out and connect.