has anyone built the Billings Nordkap?
 

I downloaded plans for this and I do not believe they are full scale could someone tell me the length and width of Part 29 the deck. I enlarged my plans up but for some reason if I use the 550 mm it says for the lower keel (enlarged of course to match the scale im doing) it comes out way wrong when it should only be around 50 ish inches it is coming out at 90 ish and the enlargement was taken from the deck in my drawings to be only 44 inches so there is no way there is another 50 inches of keel

so what I am looking for is some ref dimensions to get my parts drawings up to the proper scale