Hi Barnaby
Ohhhh - good! A JLTRT Class 20 build! - *this* is going to be interesting.
I am about half-a-paragraph ahead of you in building exactly this kit, I've been giving my kit a good coat of looking-at and thinking-at for about a month now, so I haven't got very far yet.
Two things to start with, if I may.
1) make sure that in your kit the bogie inners that have been supplied are the right ones for that kind of motor/gearbox combo - the ones in my kit were for the MM1 motor/worm type where the motor bolts directly onto the bogie inner.
When I contacted JLTRT about this, Laurie was happy to send me some of the other type, the ones with a big square hole in them, provided that I returned the ones that I have. However..
2) During the same conversation he said 'Make sure you get the GB14S as there isn't really room in there for the standard GB14. I have no proof of this, and would really love to get your feedback please?
regards
Ian