First, determine just how much further forward the roller needs to be for the Mantus
to clear the furler
drum. It may be only an inch or two.
Remove the anchor guide, and replace it that ~ 1-1/2 inches further forward. You'll be drilling new holes in the guide so that you still have 6, and you'll need a new backing plate for it. If you buy a sheet to make up plates from, about 1/4" s/s will do, and also make backing plates
for your deck cleats. If you want to use the two aft fairleads, put the deck cleats on mounting blocks to keep the lines clear of the toerail itself. I'd place them ahead of the stanchions, but as close as possible to the toerail. You really don't want foot-clutter if you can avoid it. If you want a strong point on or near the the mid-line, backing plate time again, but you might consider one of the Wichard folding pad eyes--check the strength first.
I did not see a chain hawse in the picture. Have you installed the windlass
yet? It, too, will require a backing plate. Is there a chain locker? Bow chain lockers need to be self-draining, and you'll need access for cleaning
from time to time. [For our stern chain locker on our first Insatiable, we used two milk crates, the bottom cut out of the upper one, then lashed together, to make a chain locker. It was never ideal, but it worked okay for 18 yrs.! However, it drained to the bilge
and we pumped the water
out. I'm assuming you don't want it to drain into your V-berth.
If you singlehand the boat, you might consider adding jack line pad eyes at this time; and yes, they'll need backing plates