Door Design

Does anyone recommend a company that has pre-built doors? I am looking for something with 4 radius corners.
I am also not opposed to building my own I only have some concerns about making them weather proof. Can someone point me to the supplies (a grocery list if you will) of what to get and where to get it.
I would like to model it after the design/look of the door below.
except it will be turned on its side
Thanks for any help...
I am also not opposed to building my own I only have some concerns about making them weather proof. Can someone point me to the supplies (a grocery list if you will) of what to get and where to get it.
I would like to model it after the design/look of the door below.

except it will be turned on its side
Thanks for any help...