Having just read 4 pages of formula and confidence inspiring theory - what if we don't know enough yet to be correct?
Imagine that we were discussing manned flight about a 2000 years ago.
most theories would say that you would have to act just like a bird .. be light and flap wings in proportion to the weight being carried - and it would make sense.
now we know that its all to do with air pressure differences - something nobody knew about even 300 years ago.
My point being that although we have a number of theories that either say yes, warp speed is possible, or no it isn't - it is really only guessing.
Looking back at the time of the romans and putting todays knowledge into practice - they could have easily built an aeroplane with their technology.