Another idea that would look good would be to build the 2 engines oil pump drive linkage from one of the main drivers.So looking at Hornby parts that I had it looked to be not that much of a problem so starting by making a bracket which would be held to the chassis with 2 existing screws for the electric motor I soldered 3 very small angle brackets to this large bracket and then started to rivet the linkage to these small brackets the centre bracket of the 3 would hold a 90 degree crank link which you can see in the layout here.
The oil pump linkage was made up and fitted and after some steam runs it worked ok.In the pictures here is the finished job.
I replaced the crank pin on this wheel for a longer one with the 2 flats to take the link and a small hex screw to fix it all in place.
The next part of the build that needed sorting out was the safety valves.
Even with the Hornby safety valve now 12 millimetres further towards the cab which you might be able to see in this picture as it shows the old hole position in the chassis it was still not in the right place to be under the brass valves on the P2 body.If these valves were to emit steam like the real engine then some sort of an extension or moving the Hornby safety valve still further along the chassis would be a way to go.After giving it some thought I cam up with this idea which will keep the standard Hornby lay out so should the unit need replacing in the future it will not involve remaking or moding a new valve why reinvent the wheel.
First I drilled out the 2 small holes in the cap on the top of the Hornby safety valve as in the picture then I silver soldered 2 short lengths of copper pipe in the holes.Then by bending the copper pipes I managed to bring them inline with the valves on the top of the body.
Some steam test will show how well this idea is.
The inside of the cab needs completing along with its 2 crewmen but I also need a tender and looking at the Hornby tender for the A3 if I used one of these most of the work would be done.
Having said that the body would need its corridor section removed as some might point out they never ran with a corridor tender and I would rather keep it as a spare than chop it about and as I do have the tender in the kit it makes sense to build that up and see if it will fit the Hornby chassis and wheels.Looking at the picture it looks ok all I need do is make up some new fixing points and to screw it in place and try it out.