At first glance it appears to work with 1.4.3 ok. Though I haven't finished building my ship so I'll let ya know.
Awesome job though, it's absolutely gorgeous!
In the meantime however, could you include a version of the workshop (or maybe update the existing one) to include OSE's module so we can use OSE to build parts on the fly?
Ground Konstruction & EPL seems to be integrated ok, just not OSE.
Any plans on adding IVA's at some point? Or maybe use something other than the hitchhiker can interiors like some crew cabins or something.
Also when you use the cockpit's IVA you can see the outline of the glass frame so looks a bit off.
But loving the mod, hopefully development on it isn't dead!