First off, the piece that captured my imagination, by BulldogUK.
|BulldogUK's version of the Stormbird|
The two models that provide the inspiration for the Stormbird Transporter variant are below:
|A "pure" transporter version|
While not a Space Marine Stormbird, as it is classified as an "Imperial Guard Pegasus class transporter", it makes perfect sense to be the basis for a Stormbird variant that the Space Marine Legions used to bring their Fellblades onto the planetary beachheads.
How the model was built: at Mordian 7th Regiment
|Trevor Goddard's Ultramarine Stormbird|
The blog post from GravenGames that takes you step-by-step through the construction of this Stormbird is here:
The creator's YouTube Channel is here, showing a lot of other modeling goodness! (icluding a repaint of the Stormbird for a new customer.