That does help, narrowing it down to three boats, 48-014, 48-015 and 48-016, the Mk2 Solent. Both 014 and 016 have solid watertight doors either side of the wheelhouse, while 015 had clear sliding doors fitted over the holes left by the watertight doors being left off. Seeing as your model has sliding doors, it is most likely 48-015.

ON 1019, 48-014, Lady MacRobert, Montrose and Relief

ON 1021, 48-016, Douglas Currie, Served in lots of places.
Unfortunately I don't have any photographs of ON 1020, 48-015 Hugh William, Viscount Gough. Aside from the doors, number and name she would have been fairly identical to these two. As far as I know, the Douglas Currie is the only one of the three still in full lifeboat livery and almost entirely original (aside from the number being removed). She attends lifeboat rallies quite often.
Do you have any photographs of your model? The reason your drawings differ from the mouldings is the drawings are probably a Mk 1 Solent, with a different superstructure.
Andrew