Drilling and replacing coasters with wheels

[Spaz Monkey]

Have a converted cabinet (think it might have been TMNT due to the huge CP) and two of the coaster holder screws (I think they're called T-Nuts) have come loose from the 3/4" particle board base.  They were very close the the corner of the base.  I need to put some wheels on the cab so I can change the boards, and I don't want to get a hernia moving the cab.  Should I try to Bondo the corners and re-install the T-nuts, or should I just attach some 2"x4" on the bottom and drill though the base?  I know that it's just wood on the bottom, but I'm concerned about screwing up or having to replace the base.  Am I just being to paranoid or what?  I think I'm still in the "Don't want to jack it up worse that what I can do to fix it" phase.  If I need to, I could post pictures.....

[c64rulez]

or should I just attach some 2"x4" on the bottom and drill though the base?

I think that's the way to go, but a picture is worth a thousand words