yep - tin ware missing.
what exhaust have you got ? your heat riser tubes are not connected either. this could give you problems running - especially over the winter !
do you have heat exchangers or J tubes ? - no point fitting the air hose from the fan if you have J tubes ! but dont just leave them open .
with or without bumpers is a personal choice . some like . some dont
from what I can see in the pictures it looks tidy - so thats a good start