That Lima mk3 does look great. Like you Andy, I've been collecting Jouefs for a late 70's early 80's WCML rake and even without the EE frames they are a lot of work, taking off the mould lines etc and they can be quite brittle. I actually took the whole end off one just by removing one of the paint guide lines. One bonus with them if using the original frames is that they can be glazed easily as panes can be stuck behind the frame as it is thin. I think they actually look better than the OR coach in this respect and I don't know if I'm alone when I say it's really nice to have models that actually come your childhood, from the same era as the prototype and weren't made in China.
Modelling and detailing older coaches can be a cheaper option and is often pleasurable but even though I've payed as little as 2 quid for a Jouef, the cost soon stacks up with wheels/transfers/laserglaze if used etc. There is the benefit of having all the livery shades standardised.
I'd say the price of the OR mk3 gives a little scope for some extra work for those that feel a bit dodgy about some aspects of it. Personally there's nothing about them that would put me off.