No piccies but I found our Bugaboo fitted in our E90 in the same fashion as in your picture i.e. left to right, and takes up a lot of the space. I found it fitted the other way round in the E92 i.e. front to back, there must be a couple of extra cm length in the coupe - it fitted better strangely in the alledged 'impractical' coupe.
I guess you realise the pram part can be squashed to be flatter?? It's a bit of a faff but just needs a couple of hidden supports removing from memory (might be harder than I'm remembering for day to day transport - I certain did it for long trips/holidays).
Current -: 370Z GT Roadster / Qashqai+2 Tekna 1.6dci
Gone -: BMW X3 3.0d xdrive M Sport; E46 330i M Sport Coupe; Mazda RX8 231; Nissan 350Z GT Roadster; BMW E90 330d M Sport; BMW E92 335i SE; Maserati 4200; Nissan 350Z; Honda S2000; Astra Coupe Turbo; Ford Probe