Switching over an Orion website from http to https is relatively simple. But to have it automagically redirect from http to https is a bit more involved.
1) Orion http to https
a) UPDATE dbo.Websites
SET SSLEnabled=1
WHERE WebSiteID=1
b) Create a CSR and have the client provide the certificate
c) Install the certificate

d) stop the default site (also change the binding to 8080 - just to be safe). create bindings for Orion for https using the imported certificate

2) http to https redirection using URL Rewrite
a) install URL rewrite for IIS and add a rule for redirection.

b) Configure rule

That's it.
One thing I have noticed is that if you're using additional web servers behind a load balancer - google maps may not work properly. You will have to rewrite the google maps code to use https.
Thanks
Amit
Loop1 Systems