Posting the layout and pictures of adjoining spaces would also help people help you.....

With that size island you may have trouble getting jumbo size of quartz large enough. Jumbo granite slabs can be found. Might want to shorten island to 9’ if not too late.

^^We had to shorten our island to match the slab size. Ask questions to the fabricator regarding seams.

Here is the proposed layout for reference. Opening the west wall to flow into family room. East wall has windows so cannot put anything there. Photos of the space would not be helpful as it is a completely different setup and look currently.

What is going in the bay? I do agree you might need to shorten the island to make quartz choices a bit simpler and to avoid a seam.

A small round 4 seat kitchen table will go in bay most likely

Egan-I would reduce island length by around 12”. I would eliminate pony walls on ends and use decorative cabinet end panels and reduce 18” cabinet on far end to 12” cabinet. Make sure your cabinets are designed with proper metal support plates for slab. 12-13” overlay for stools is tight. I would expand to 16”. Most slabs can accommodate that total width. 36” deep plus 4” more would mean slab has to be 40-44” wide and 108-112” long. That is doable for most slabs without seams.