sorry, didnt notice the link.
yah the file structure looks good on your redirect. The game server should show mods and usermaps folders in its root, with the same files in their folders as on the redirect.
clean the iwds - open the map iwd in winrar - if theres any folder besides "images" and/or "sound" delete the folder while the iwd is open in winrar.
Same thing for files in the iwd - where you see the images folder, if there is for example, an .arena file, delete it.
now upload the cleaned iwd to the game server and to the redirect