Not only condensation on the inside, but also salt spray on the outside of fixed windows, however good the doghouse design. OK, in an extremely small ocean going boat, it might very occasionally be wise to seal yourself inside, barrel-fashion; but the Sarum 28 is not that small and vulnerable to knockdowns. Only when one has experienced having one's eyes, ears and nose outside gathering all available information, and one's body inside in relative shelter, does the genius of the Hasler pramhood become apparent.
Assuming that the layout includes a heads compartment to port, extending to the centreline as in the example that Hans-Erik found, then it would appear reasonable to offset the mast to port also, between the heads bulkhead and the forehatch, with a high AR rig. However, if it needs to go through the forehatch aperture, it should be straightforward to bolt a thick piece of aluminium plate in place of the forehatch, as a basis for the mast partners.