Well I am not happy with this at all.
In the end the issues that I had by trying to follow Westwoods notoriously inaccurate 3 views, with the numerous alignment issues, together with also trying to follow a Challenger blueprint, has meant that the end result is a bit of a mess, with a large number of issues with the turret area.
I would need more practice with this kind of set-up in order to get better at it.