Also available are the sheet plans for the aquarama. there are 7 sheets in total with details on frames, chine, engine placement etc. these are collectible plans.. Riva aquarama. scale riva powerboat, 730mm length by 210mm beam. two sheet plan giving all frames templates and some construction data.. Phoebe (model boat plan) two sheet plans, originally published as ‘free plan’ in october 99, for a modern steel motor yacht at 1:15th scale..