I'm looking to buy a good condition (running), mid to late sixties
Mercedes coupe (220seb / 111).  See: http://tinyurl.com/8mhhy

The plan is to buy the car, then get it to a full service garage (that
does restoration type projects) to be worked on.  I'm not looking to
have anything close to a show car, just a good daily driver.  I want
to find out what types of reasonable things can be done, RE:
increasing the safety factor.

I understand that it's impossible to make an older car (especially one
thirty-plus years old!) anywhere close to as safe as a new car.

I want to avoid a frame-off restoration, but I'm not looking to do
this on a shoestring, or piecemeal.  Definitely I'm not overly worried
about 'spending more than the car's worth.' Also, while I'm not a
mechanical guy, I don't mind working on cars with someone who knows
how - and I don't mind paying someone to do work on a car.  I get a
kick out of old cars -- I just like 'em.

Here are things that sound like good ideas so far: 
 
- Putting on disc brakes (power, even ABS?)
- Installing a newer windshield wiper system, and maybe an aftermarket
rear window heating system
- Modern lights
- Modern safety glass (Lexan?)
- Good, wide, radial tires
- Great springs and shocks
- A new wiring harness 
- Safer bumpers
- 'Anti-roll' or 'sway' bars
- Putting in a collapsible steering column, and padded steering wheel
if the car doesn't have them
- Possibly putting in a newer engine and transmission
- Putting in good guages, or a whole new instrument panel
- Padding the dashboard, or putting in a new dashboard
- Putting in a newer gas tank (or 'fuel cell') and new fuel lines
- Possibly putting in racing seats, or newer seats
- Having the existing frame augmented
- Keeping the car in great running shape 
- Keeping a fire extinguisher in the car
- Taking a driving course to beome an even safer driver
- Staying off the cell phone, just because
- Possibly installing a roll bar or cage, and newer belts

I've read that installing any kind of airbag on an older car is
basically impossible, and while that makes sense, I have read about
'user activated' type airbag products being made available for small
airplane pilots:  ttp://tinyurl.com/afu46, and for motorcycle riders:
http://tinyurl.com/drocq.  If something along those lines could be
effective in a car - I'd wear it!

Also, I've had the thought that racing drivers seem to be pretty safe.
But, I've read that while a 'racing' type seatbelt/harness may be a
good idea for a race car, some people seem to think they may not be
good to install in a daily driver.  I've read differing opinions
regarding roll bars, roll cages, and harnesses in general.  One, that
they're great, much better than any modern lap belt, go for it.  Or,
alternatively, that having any type of belt connected to a roll cage,
or roll bar, can limit the movement of the driver, detrimentally, in
an accident.

In my searching, I came across the terms 'restification,
'restofication,' and 'pro-touring.'  'Restofication' seems to be the
closest word for what I'm looking to do.

To put this into a question:  These are the things I've read about, or
thought about.  Please give me solid recommendations regarding things
that can be done to increase the safety factor while driving this type
of of car.  Thanks in advance.