[camaraderie]

It ewill hold a Danforth up to 35 lbs which is a pretty big Danforth...probaly considerably bigger than yours. Your pulpit should easily hold it as it is designed to hold a person's weight.

You can google bow rollers for individual anchors but all the major marine stores carry them. A DUAL bow roller system would require custom fabrication consisting of individual bow rollers welded to a custom plate and affixed to your deck. Any manchine shop can handle this but you have to be quite precise in the ANGLES you want if you are going to install a windlass since both bow rollers will have to align properly with that windlass.
The sailnet store and others carry a wide variety of windlasses. Installation requires planning and precision AND consideration for the battery and electrical provisions required rather than just the mounting. You can do it if you are handy but it ain't cheap!
Spend some time on the bow of your boat and visualize how it all might look. Then take a tape measure and get an idea of the space you have available...you don't what the shank of your anchor to extend back to the windlass and you need to look at the angles both horizontal and vertical required to get a good feed to the windlass.
Also look underdeck and figure out where the backing plate and any under deck portion would have to go and if there are any obstructions. Then consider where you will put the batteries and how to run the thick cables from batteries to windlass.
Then start shopping with a clear idea of what ou want to do!