no need, I already put another set in the post last night for Herb.
The kit manufacturer already took care about this. Both intake and ducting match to the inner dia. of the outer shell. Nicely made, no need for fiddling with a Midi Fan, which the model was designed for. With the DS 51 a little modification is in ordr, due to the thicker shell of the fan.
I will drop you another email offline soon reg. the things you are waiting for. There is good news.
With a new shipment recently we have reached the end of the waiting list. So delivery time of the MIG comes down to about 6 weeks at the moment.