sheds from the shed guy up the road from me and convert it into a loft.

it seems to me that most racing pigeon folks prefer the use of a storage shed and then convert it into a loft. i am new to this and if it works out i will need to get a larger loft.
for those who purchased a pre constructed shed to convert into a loft, what where some key features you needed to have? style? height? width?
i know by looking at most pictures that the entrance doors where at the gable end.

 out of  found this valuable. Do you find this valuable?