Thanks Jonseyyy and everybody for helping out.
We have decided to go for a full length ultra low profile, flat baha utility. We are going to experiment with removable sides/ends - I am going to discuss this with Baha before placing the order.
We will be mounting an inno ski box to the flat rack, either directly to it with foam providing a small space, or by mounting cross bars with minimal space between the flat rack and cross bars - the idea being to keep everything as low as possible.
I love all these racks, but decided on the flat for its super low profile (better MPG) and suitability for hauling a canoe, which we do often.
Once I get the rack I will update the form with how to mount a ski box to the flat rack, as I have not seen this on the net yet.