Matt,
My model is 69cm long overall and 19 cm beam. However, after thinking back to around 1988 when I built it and looking at the MMI issue that announced the plan, I used the picture of the plan sheet 2 of 3 shown in MMI Oct/Nov 87 on page 35 and used that, scaled up by a factor of 4.513 to get the size and shape of the main keel, main deck, chine deck and bulkheads. The detail was taken from the main drawing on page 37 of the article, supplemented by various John Lambert drawings I already had (I built a later war version with two 20mm gun mountings). So in fact I didn't use the plan as actually printed!
The Les Brown article says " The model was built to a scale of 3/8in to 1 foot, giving an overall length of just under 27 inches."
If your plan is genuinely 90cm overall, then, as kiwi said, it seems to have been printed at something very close to 1/24th scale. Your options seem to be to either build it at that scale or get it photo reduced to 76.7% of the size it is currently or complain to the supplier and see if they will sort it out.
Send me a pm if you want any more on the original article.
Francis
