Nice. Should be very drinkable ( i volunteer
I have not used 3787 before but have used WLP530 in tripels pitching low and letting free rise to whatever. WY3711 will dry it out with a spice character, may or may not be the profile you want.
I know WY3522 will should attenuate well with light fruit and tart from the yeast. I don.'t know if you have used D-180 before. I have used D-160 a while ago and remember it to be dark fruit an chocolate with almost a "metallic" profile, hard to describe.
Never quite sure if a quad is "just" a barleywine with a belgian yeast but I do know that the hgh alcohol will generate its own flavors.
-Cheers and let us know how it works