Welcome to the Quilting Board!
First: the 201 will sew through two layers of that vinyl without any trouble.
Second: the polyester upholstery thread we used years ago is so heavy that the machine will sew with it,but getting the bobbin tension right might not be do-able. Or will take some doing, don't know yet as I hate to mess with the bobbin tension.
Third: A size 16 jeans needle works just fine.
Now to fine tune our efforts and do this thing.
Through Christ who strengthens me, I can do all things. - Paul
I know whom I have believed and am persuaded that He is able to keep that which I committed unto Him against that Day. - Paul
Chris, servant to three demanding cats