I bought a high quality Agressor 2 1/16" hole saw for drilling 3 VDO gauge 
holes under the radio space on my 79 Breadloaf.  talk about tricky drilling!

In your case, I think I'd drill the pilot hole(1/4" prolly) before I 
started the hole saw and then try extending the hole saw pilot bit out a 
little further to hold your position once the saw starts digging in to the 
uneven surfaces. I have a full set of the Agressor hole saws now(I think 
the kit was about $70) and they cut flesh and steel without regard for 
race, creed, or ethnic background.  The individual ones are about 8 or 9 
dollars I think.  I think the individual ones have a built in hex shaft so 
you don't need the adjustable spindle part.

My guess is you'll have this hole drilled by the time you get this message 
anyway!!

Max

t 12:19 PM 1/22/2005, jimt wrote:
>On 1/22/05 11:01 AM, "Gerald Masar" <azsun99@EARTHLINK.NET> wrote:
>
> > I need to cut a 50mm (slightly less than 2") hole in the floor of my 
> '90 Westy
> > to
> > install a gas furnace. It will be in the back corner of the small 
> compartment
> > to the
> > left of the fridge. I looked at holesaws yesterday, and besides being
> > expensive to buy
> > one for just this job, I am wondering how well they would work on the 
> uneven,
> > ribbed
> > surface of the van floor. And the hole will come out 1/8" away from the 
> main
> > side
> > beam.
> > Any hints, tips, suggestions on how to do this?
> > Thanks
> > Jerry
> >
> >
>
>A hole saw will work but is tricky to control in that space.  Done it.
>Extra damaged knuckles job.  Coming out the bottom I suspect a propex
>furnace.  Use a cheapie hole saw set from harbor freight or similar.  A
>couple buck throw away.
>
>����������������������������������������
>jimt
>Planned insanity is best.
>Remember that sanity is optional.
>http://www.tactical-bus.info (tech info)
>http://www.westydriver.com