Why would rigid chassis be an issue surely it's your sideplay that's the issue and not the up and down or have you limited your side play as Well? Looks good all the same
Is that the design of the frames or have you added washers. If it's the frames what width are they over the outside plate work please. I've also found top hat bearings vary quite a bit in the thickness of the rim and that can have a limiting factor to side play. Finally what's your ruling radius, I'm going to guess it's around six foot looking at your railway build.
Only asking as I tend to prefer rigid set ups but with sideplay built in.
It's a combination of the frames, and the thickness of the top hat rims - they look like they have had some ground off to get the wheels on in the first place. I will have a measure up and let you know the frame with.
There are other frame spacers provided and I am not sure which were used because the basic chassis was built when I got my hands on it.
The last few days working on the B16 have been spent on making up the rather prominent cylinder crain cocks and their operating mechanism from the ends of JLRT coach vacuum or some such pipes of which I had four in my spares box and scrap etch. I also made up and fitted the rear sand pipes.
Tonight I reassembled it and took the following photos before dropping it off at Warren's for painting.
There was a bit of discussion on one of the forums (it might have been the GOG forum) about which hole it the brake spreader might fit through and I decided to leave it through the bottom one (I think). It's too late to check/change it now because I delivered it to Warren last night.
From the smaller of the NER tenders but I assume the brake gear would have been the same. Nothing a bit of plastic or brass rod and a dab of black paint won't sort when it comes back from Warren.
Out of curiosity what livery will your B16 be presented in? I do like these loco's, more so the B16/2's and 3's. One day I may have one of each