Yes, @SabreDynamics did the Metr CAN + SD housing. I think it makes sense for us to also look into a combined housing in the future, but there is no timeline set for it at the moment.
All Metr Pro CAN / LTE bundles with GPS come with the BN-250 now. We decided that the larger antenna and integrated flash is a bigger advantage than the downside of the slightly bigger dimensions. For people that still need the smallest possible GPS module we are selling the BN-180 separately now.
Yes, they are using the same BN-250 GPS when buying them bundled with a GPS. The only difference is the cable because the Metr LTE has an other UART pin layout compare to the Metr CAN + SD. For Metr LTE it isn’t important which side of the JST SH cable is plugged to the GPS and which to the LTE port. For Metr CAN + SD it is important to connect it the right way. Have a look at the following pictures to see what I mean.
Thats a question for @rpasichnyk. Not sure how it would behave with the current implementation.