Thanks for advice. No paint it will be then, just cleaned and sealed.
Nick - I built it that way for a reason with regard to the firebox and boiler.
The way Mamod supply, unless you have a lineshaft a reasonable distance from the se3, it gets in the way of the burner.
I intend building a workshop on an identical base to sit adjacent to it, so having the burner turned round 180 will make it easier .
Hope that makes sense.