I just finished a mono with the os.18cvr belt start boat 24in. 2-1/2 pound. Im impressed with the engine got it running strong. all I had for fuel was 30% heli cool power. heres a link to a couple pics of it running.
http://www.rcuniverse.com/forum/m_5041733/tm.htm
Is the wood inside the hull sealed cant tell in the pics you might want to seal it if it isnt. Looks Like a nice boat good price too. Dave