Actually, there is something available:
1:350 Britannic brass conversion set. Includes full brass replacements for B-Deck and A-Deck superstructure sides, full set of gantry davits (enough to build RMS or HMHS), lifeboat storage racks, aft well deck side bulkheads, poop deck smoke room bulkheads, children's playroom bulkhead, red crosses for boat deck and miscellaneous other parts. Includes full instruction sheets containing detailed information about using the parts.
Price $45
Click here for more info: http://titanic-model.com/brass.htm