Certainly looks good to me. 28mm is technically 1/56, but the bulk of most figs and their width is often closer to 1/48. Add the bases to the height, and I think that 1/50 is probably going to look as good or better than 1/56 would, especially if you want room for some skirmishing.
Plus, what's the difference in size between 1/48 and 1/50 ? An inch of overall length? Seems well within limits of size variation between different ships.