I tired that with balsa wood & wood glue on an antweight. It did increase its strengh but warped the wood in the process. Dont think it will work on a bigger scale but you never know. Try asking WJ if he has strengthened the MDF Armour on Gravity 4 . Well thats what it looked like on Arthers Pics.

As for easily fixing armour. Never damaged a panel enough to warrent replacing/fixing it yet. Repairing armour for us means making a new piece. Its not been designed to be fixed in a hurry