Hello Again,
Previously I said:-
"I now set off on a 'good-dose-of looking-at ........',
and finished with:
"That's all for now but more, with pics in a few days time."; - Well, here they are:

The "good-dose-of-looking-at" led to an idea for scraper pick-up soldered to a cantilever plate, such that the phosphor-bronze wire scraper could be fixed away from the under-frame and have contact with nought but its fixing and the back of the wheel flanges - no fiddly bending and no need for very accurate measurement or fixing. To make for fairly easy maintenance, the cantilever plate could be mounted onto the removable axle retainer.
Unfortunately the plastic of the latter was of that greasy-feel type that adhesives seem to detest! On this example, the prototype as it were, I eventually got araldite (slow-set) to hold the plate, but to add some 'braces', I added a bridge of araldite on top.

This is the driving bogie and benifitted from my first attempt. Here the plate was not only araldited to the plastic, but soldered to a pin through the plastic. Care was needed here so as to keep clearance between axle-retainer+pick-up parts from rail-head; its not much more than 0.060" without the added pick-up!

With thoughts of maintenance and DCC wiring, I decided that the pick-up wires would terminate at solder terminals (i.e. - a bit of PC board!) This 'washed out' photo' shows the termination of the wires from both my and Lima's pick-up from the powered bogie.

The other bogie retained the Lima circlip and wiring through to the opposite end but my wiring terminates here so as to aid easy un-soldering should I need to remove this bogie. That bit of blutak is to limit movement of the circlip and possible contact with my bits of added pick-up.
The red wire is soldered to a pin which in turn is soldered to my cantilever plate; the pin gets through the Lima floor via a slot which allows for bogie swing.

Since this picture was taken, a red wire has been run from back to front connecting my rear bogie pick-up to the main solder pad at the front. This will be the main pick-up termination point.

With the ballast weight added I thought we had a risk of short-circuiting the solder pad, so I cyanoed a piece of cigarette paper around the end of the weight which allowed a bit of colour coding too!

All this has now been assembled and the DMS has been run all over both 'Birch Vale' and 'Bowton's Yard' a few times. Much, much less 'fingerpoken'
now, but not quite so good as I expected. I'll accept it for now; the decoder will improve running almost certainly; we shall see.

Good modelling and Merry Christmas to all, - see you in 2017!
Dave