So I thought I'd put theorising aside for a bit and do something practical.
On my girlfriends advice (A much better painter than me) I dry-brushed the base colour on this rather than paint it normally and it turned out much better than usual so I'll be using this method from now on.
Now I need to make Heavy Bolters for the 'sponsons' and Autocannons for the 'turret' so I can use It as a Predator in my semi-mech/mech Marine lists.