Hi GW Mark,
I'm also building the HL 0-6-0.
If I may offer some advice - the front frame stretcher (3 holes in) has been soldered too far forward on your model. The 2 outer holes are for locating and securing the cylinder assembly.
It's quite a straight forward kit - I recommend simulating the centre raised section of the saddle tank with tape instead of the suggested scoring of the etch before rolling. This looking far superior and more prototypical. I have also opted to leave the brake rodding off mine to aid in fitting the pick-ups, to make it more straightforward.
I've also chosen to use Markits wheels, with self-quartering axles. This is more helpful if the chassis is planned to be taken apart a fair few times to tease out running issues. This will however require the use of Markits "super-deluxe" crankpins, as the rods need bushed crankpins due to being designed around the Gibson product.
Hope this helps, I can post some pictures of mine (slightly further progressed) if you would like?
Paul A.