I've just built this GVT loco body kit again with the Branchlines chassis, the last time I built this body kit was 1978 I was 14!
I'm now a professional modelmaker of 30 years experience, I got this to use as a display loco mainly, you can see the kit is pre CAD and CNC with lots of fit issues which I remember from my youth. I managed to put it all together concentrating on getting the corners of the body to line up so that when I filled the gaps it all matched. The smoke box end is slightly tapered on one side so I evened that out so that front valance fitted. The branchlines chassis is interesting it runs ok but there is so much movement on the wheels it seems. Firstly the motorised axle has a lot of sideways play so I limited that with washers,secondly the other coupled axle has vertical and sideways movement and is connected with a compensation beam to the rear pony truck, so the whole chassis to me seems far too flexible about its wheels, I'm going to make the four coupled axles more rigid and the pony truck I shall try and fit springs on it's sideways movement and limit its vertical movement as my test track is completely flat. I would recommend perhaps getting hold of a Dapol 14xx 0-4-2 if you insist on this wheel arrangement but an 0-6-0 with no centre flanges is probably better.