[brian51]

oh Pierre, i think this looks fantastic as is !

I mean any highway interchange builders who would be better than you are,
would be on a very short list indeed..

I would give my right arm i think to even have 50 % of your ability to build these master pieces of yours

Also it looks like this have 3 levels so as such would qualify as a "stack interchange"  as well..

But sure, if you feel you can still improve this further, i am quite sure all of would love to see it and envy it