So size does matter! ;-)
Yep, and as with everything bigger is better :-)

I'm having a love hate relationship with the legs where they are.

The two upsides that I can see are that I can have a more rigid gantry without losing X travel that wouldn't have been lost anyway and it gives me a 50mm recess each side that I can move the Z-axis into. I'm hoping that will allow me to achieve 800mm of workable length on the Y axis but I'll be happy with 700. The downside of course is that the machine has to be that bit longer in X. The longer X is though the small the loss is as a percentage of the total length - yet another reason bigger is better :-)