https://irishrailwaymodeller.com/topic/2449-popeyes-workbench/page/2/
I built one a few years ago. You can take a look at my workbench page 2 and see if that helps.
The roof is the tough bit, good luck.
Sometimes I cut the coupling where the red line is in the picture and make a
new hole where the red spot is. It might keep it away from the axle.
I use different methods depending on how much room I have.
Perfect, there's a lot of fiddly detail parts to go on and they take time but they are
worth it in the end.
I usually keep my couplers nearly level with the buffers and they work fine, it also
keeps everything close together.
They don't look too bad a match.
The MK2d is Supertrain and the MK2a is IR so they normally are different.
The supertrain livery is usually a bit more brown.