Well a few notes for you.
1 - Legacy was scripted so to cover many old references such as how the Borg & Vger are linked, how Picard got his command, the omega particle / directive, 2260's Federation / Klingon War & in TOS there is mention to Earth using nuclear weapons.
2 - Legacy is canon, though I wouldn't regard a few of the ships as canon when it's clear that they're just been added to the specific era's due to there been a lack of available unit class' to choose from.
3 - Until around 2200 the United Federation is known as the Confederation from what I can tell.
4 - Finally you might what to look up http://www.starfleet-museum.org/
as your ideas sound like they could fit into that timeline. Also look up the Comet class there as they were the testbeds for the Daedalus.