Speak for yourselves... the plan views of parts I've done have been as accurate as the elevation views. I think plan views are a very useful part of a ship drawing - even though I've only done one or two. It's something I eventually want to do for the Alaska (as well as a front view!)
I am speaking purely for old parts (including some of the ones I did in the past) and the belowdeck parts, for which accurate references were not always available.
boxofroundrocks, feel free to PM me if you want to know if parts are accurate, if I do not know for certain I will guide you to the correct person who knows, or do research for it. it is not an bad idea to gather top down parts, but IMO any sheet should be proven accurate before everyone starts to use it's stuff