t-b-g
I agree with your final paragraph, for the money we have a pretty good Blue Peter from Bachmann. The one thing I can't abide is the wildly inaccurate angle of the slide bars, I am working on my BP to improve this.
Regarding your points about boiler access doors, I assume your mention of handles not being in line refers to the bridge pieces visible, these hold the doors to the boiler shell and are not handles so don't need to line up with each other. The holes are positioned to allow water jets and tools the best access to get scale and sediment out of the water spaces. Bachmann have worked with Blue Peter in its present display condition so the holes in the sheet metal cladding may be slightly distorted and may have given Bachmann the wrong impression of their shape, however they are just for a tidy appearance.