Pot still column design

[Chevyman]

Getting my ideas in order for a build. If a guy were to use a triclover clamp to join a 2" copper column to a keg and that column was about 18" tall would it be advisable to use a 2" 90 degree elbow followed directly by a 2" to 3/4" reducer? The plan would then go to a 6" long piece of 3/4" to a union that joins a 36" long 3/4 over 1/2 liebig to that section. Is that abrupt size change after a 90 likely to be a problem? Done lots of reading and haven't seen this addressed, apologies if my search skills have failed me.