@unknownuser said:
"I chose the 3ds format again because in obj the model was importing into Poser in at two different scales and 3ds was not."
ah
this one, when you import in poser, you'll have the choices "Percent of standard figure size 100%" and "centered"
turn those OFF. ok, the model will import at a huge scale,(poser scale is tiny. a legacy thing), but it will then import at the correct scale with each other and in the correct position to each other.
then in poser, open the Hierarchy Window, and drag the pieces together to form a single unit (eg, for your model above, drag "Dome" so it becomes a child of "Walls").
then select the parent and rescale that. the child parts will rescale as well.