Wheels mod (LAC)

[tihol tiholov]

Haudi all,
I would appreciate general advice and BTDT on wheels.  I need 4X108 15"
wheels and the single add offering those in the marketplace was on the
wrong coast.  Plus, they were nice BBS ones and want to play in the
dirt.  So, in case no-one has any to get rid of cheapish and the
shipping costs being high-ish, I'm thinking of getting some from Ford
(Nomex on) being plentifull and all.  
First set of ?: Has anyone made sleeves to fit between the hub and the
wheel?  Did they work?  Is Aluminium strong enough for the sleeves?  Any
ideas on shape?
Second set of ?: Is it really dumb and unsafe to bore out 4X100 to 108? 
Will the wheels fall off?

Thanks in advance for any advice,   

TT