Size of the proposed "new" space vehicle?

Since the "new" space vehicle is based on the Apollo spacecraft, I have to
wonder:
-Yeah, a crew of three can live quite nicely in it on a 10 day venture
to the moon and back, but what about a 7 month trip to Mars? I think the
astronauts will go nuts in that tiny enclosed space.
-Will the systems be wired and routed in the same manner as the 1960's
vehicle?
-Will the care in building and fire-hazard procedures be followed as
closely as they were post-Apollo 204?
-How many hard lessons will we have to endure in the evolution of this
vehicle, as was paid for with the Apollo's and shuttles? Obviously, test
vehicles must be developed, flown, re-evaluated, flown, re-evaluated...etc.
How far ahead of the curve can we stay with a new vehicle concept, owing to
what we've already had to pay for in lives? Test pilots die. That's a
fact. Reducing the number before the fact is the engineer's job.