Gerard:

I'm sorry to hear about your jack accident.
The area visibly damaged is behind the firewall.
I would guess that the damage is confined to the
impact area, but my guess isn't important.
You'll have to cut away the damaged fiberglass as part of the
repair, so you might as well just cut a hole there to make
the rest of the damage inspection easier. A router or die-grinder
with a carbide burr will quickly remove a rounded hole just
outside the edges of the visible damage.

When you can see into the damage area better, you may
find that it will not be necessary to remove the engine.

You may want to at least drain the oil and gasoline so that
you can turn the aircraft on its side to work on it more easily.

Before you finish the work on the plane you may need some
stable jack stands. I like this one:
http://lancaironline.net/archives/jensjack.jpg

-bob