Thanks, your comments are very much appreciated.
Looking around the diverse work shown off in the forum, I know my skills could do with much more improvement, but the nice thing about these hereabouts is that encouragement, hints and advice do sink in, if my more recent models like these are any evidence - so thanks to all!
As for my next 1:72 scene, 'possibly' later in 2019, maybe I'll join in O/400 fever, and tackle that old Airfix Handley Page I have lying about.
And now going off at a tangent, I see that the Wikipedia page on the O/400 declares that "When built, the Type O was the largest aircraft that had been built in the UK". But this is contradicted by another Wikipedia page. One of the many surprises I had while reading Colin Owers' fascinating books on the Fighting America Boats, is that the Porte Baby did go into limited production, and indeed was still in service at the end of the war. They weren't really capable of adequately defending themselves, especially during their main intended task of patrolling the Heligoland Bight. They were used to patrol areas where they wouldn't encounter those pesky Hansa Brandenburgs. But also, one was interestingly employed in tests with a parasite fighter, launching from the top wing.
The Wikipedia page on the Porte Baby shows that, having first flown a month before the O/100, the three engined Baby was bigger in all dimensions and quite a bit heavier.
Just saying!