I think if Relic wanted a bulbous canopy they would've put one
What I think the scout texture was implying was that the Kushan's scout had an armored "bathtub" like cockpit, with little viewing windows. If you look, you'll see that the Scout had a very thick/fat nose, and very square - I think they did this on purpose, not just because they were limited poly-wise.
As you can see the amount of grey far outweighs the darker grey "canopy". I think the whole thing was meant to be raised and armored like I described above.
As you can see, the Taiidan Scout followed a similar design ethos:
This is the problem that you'll get with "re-imagining" classic ships like in the Homeworld series - you'll always end up with people thinking that you did it the wrong way