I have a free G-Cat Main beam for anyone wanting to pay shipping or pick up. Ordered new, never used, but in storage for 25 or more years.

The G-Cat 5.7 is a fast, nice handling boat. I raced one quite successfully for a while back in the late 70s or early 80s and it was as capable as the other 18 footers back then. The lack of a boom had no noticeable deficiencies as far as I could tell, although all the other cats I raced had booms.