Bartertown.com

Every now and again I see a Knight cut up to show the cockpit and pilot... but it looks kind of silly as it is open... Is there maybe a clear plastic bit to cover it or an openable/closeable hatch? I like the idea but a lot of money to make the knight look a little odd.

Does anybody know if the FW Terryn Upgrades will fit on a Castellan? I can see most Knights, but that one maybe not... Also, no way it will fit on the smaller Helverns/etc...

Anybody actually used these?

Thanks,
Sean