Normally the bus duct alignment from the switchgaer to the transformer needs to be carefully done. If there is minor deviation in the centre line of the transformer with the switchgaer centre line the bus duct can't be alinged.
Busduct earthing is importnat. There shall be Copper or Aluminum flat along with the busduct.
For Isolated Phase Busduct Busduct support structure shall be properly designed.
Care shall be taken while leaving the cutout for the busduct.