Matthw,
welcome to the forums! It's quite something when somebody's first post is a worthwhile contribution. One or two things that need tweaking, however: firstly, if you compare this graphic to the original that you adapted, you'll see that the shading is not the same. The broad side (on the right) of the third image from the left, for example, needs to be quite shaded.
In Pak128.Britain, this is done by creating the vehicles by exporting images from Blender models. The Hood has the original Blender models if you need to adapt them.
Also, unless I am mistaken, it is a little out of scale, being slightly too large compared to the Reliance from which it was taken, the latter being a full-sized coach, this vehicle being a minibus.
However, smaller single decker 'buses from the 1960s onwards are indeed in shortage in Pak128.Britain, so your effort is most appreciated. With those two suggested changes, it will look very good in the pakset :-)