I feel your frustration on the limited info. I researched for months too. If you pm me your email. I have the complete 1997 Four Winns catalog in pdf format. It has specs and photos for reference. The Four Winns web site has info on parts for previous model years too. Here's a link to the page for the 203 Coast Runner.
http://www.fourwinns.net/partbook/basemodel.php?model=203CR-C97The 150 hp does like to drink some gas. The oil reservoir is in an awkward spot. I made a dipstick for it and marked it 1/4, 1/2 ect... My Coast Runner has the 2 igloo coolers behind the seats with cushions on top. I also have the transom shower option, dual batteries with a switch, bimini top, and camper canvas. I actually have a spare camper canvas with windows, that encloses the entire cockpit for bad weather. It is red canvas, two sets came with my boat. If the red works for you, I might be inclined to sell you a set, if you're interested. I have a SS 14.25" prop with a 17" pitch. Top speed with just me in the boat is about 40 MPH. One of the best features about the boat I love is the trim/tilt switch on the powerhead of the motor. Makes it real easy loading the boat on the trailer to lower the motor on the trailer lock with the switch on the powerhead. Be sure to post some photos of her when you pick it up. Happy to help another Coast Runner owner. This board has been a great source of knowledge for me.
Personal message me if you would like the PDF of the catalog or you are interested in the red camper canvas.
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Mannix2
Hyde Park, NY

1997 Four Winns 203 Coast Runner-150hp Ocean Pro Evinrude
"BONA 4 TUNA"
1986 19' Bayliner Capri 125 Force