If he really wants a front trunk I would be happy to let him have some of mineyou are really out of luck trying to add a front trunk, but there are several options for the rear, the passenger backrest will have to go but the mounting stuff is under there, do a search in accessories and aftermarket and it may help welcome and enjoy
If you go to this Page it has on it all you need to Know for 10kg capacity cases. LINK and this page for 5kg capacity cases LINKI just purchased a 2009 Burgman 650 and want to add a rear trunk. It doesn't look like there is anything to mount to. Any suggestions would be nice.