I already have the Warhammer Forge Theodore Bruckner model, a special character from Nuln (with all the iconography of the City of the Griffon Emperors) and I thought it would be freakin' awesome if he was able to fit into this unit, either as a unit filler or as a Preceptor/Grand Master.
The problem is, he comes on a chariot base (50 mm x 100 mm) and the Demigryph bases are 50 mm x 75 mm monster sized, meaning he will not fit in a manner pleasing to my 'Hobby OCD'.
However, Bruckner would fit remarkably well onto the 50 mm x 75 mm base. Unfortunately the GW online store does not sell this particular base size (though it sells most others). A brief email conversation with a 'hobby rep' from GW Australia indicated that there are no immediate plans to release these bases for individual sale. The suggestion was I take a normal 50 mm square base and a cavalry base (50 mm x 25 mm) and glue them together.
Well, OK, better than nothing. If anyone else out there is in the same boat as me, here is how I did it in case you need some ideas. You will probably have a better solution than me too, with more supplies at hand to make it happen (and if so, please let me know how you fared!).
To start with, I lined the two bases up and cut small gaps in the sides. Into these I pressed straightened paper clips to try and keep them lined up and reinforce them, and then filled in as well as I could with superglue and green stuff.