@okh

I was merely trying to point out that once you have a shape and you know the areal of that shape – and on top of that have a program like SH3D, which even saves you the trouble of calculating the areal of your copy – you really don't have to calculate anything but the percentage to get it right. You can even use a free percentage calculator found on the net.
But, of course, my assumption was that mr/ms sorrow was holding a plan of more common size, a sharper and more detailed plan than the miniature image that was linked.

Please order me a double Laphroaig, no ice

Agree... but the suggestion was not for you... [:)]
One Laphroaig coming up, ( double is still not allowed in Norway, is it?) and might I join you with my Japanese Nikka Coffey Grain?

cec