Under height transfer tab,the icons show all red ERROR's also their spawned models are ERROR's too , appearently they are uploaded except their models.Not a perfect way to fix that is to download heighttransfer models from another source (e.g svn) and put it in game folder.Doing that doesn't remove ERROR icons (rerendering won't work) but they can be spawned with sbep part spawner and work perfectly alongside with assembler and habitable module function,you just need to spawn to see what they are then select the one you want.
Tried verifying,reinstalling; no chance.
So please add smallbridge heighttransfer models.