Hi, i am new to the board. i acquired an 18' tri-hull thunderbird that is registered as a '73. there is some question about the year. i would like to know if someone would be able to help with a model name or number on this boat. it is a deep hulled boat with a self bailing casting deck and a 120 hp mercruiser i/o. the boat has no interior and i am going to build one. would also like suggestions on that. i can't complain about the price that i paid ($50). even if i parted it out i could make a profit. but, i would like to make a good boat out of it. the hull is in good shape and just needs some TLC