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You can get the acrylic material from most any plastics shop.. if you can get the old window off in one piece they can use it as a template and cut new for you for a reasonable cost as a rule. Clean the old sealant off as completely as you can.
Buy 'plastic cutting' drill bits, and drill the panels to match the existing fasteners, quite 'oversize' for the size of the fasteners themselves to allow for expansion.. those ports are quite large, IIRC. I think it's better not to countersink, and use panhead screws or bolts to reattach the new port.
Carefully mask the area around the port inside and out, and use a sealant like Dow Corning 795 as an adhesive/seal. Gently, evenly tighten the window, avoid depressions in the panel at the screw holes. The DC 795 will end up holding most of the load, the screws are there mostly to hold it while it cures.
Wipe the excess sealant carefully away, remove the masking and 'voila' there you are.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)