rimless glasses, bendy glasses, plastic v glass etc

i need some very basic info about the options when buying glasses.

my prescription is:
R sph -6 cyl -1 ax 180 pris 1 base DN
L sph -5.75 cyl -1 ax 180 pris 1 base UP

with this prescription, can i get rimless glasses? or is it too strong?
if its too strong, would half-rimless work out?

are there any restrictions on bendy-metal glasses (e.g memoflex) with
regard to prescription? also how exactly does bendy-metal frames work?
are they essentially unbreakable? are they heavier or lighter than
non-bendy frames?

i read that the latest plastic lenses are lighter and thinner than
their glass counterparts, is it true? how badly do they scratch, will
cleaning it with a cloth likely scratch it?

transitions lenses (aka reactions) - in darkened mode, are they the
equivalent of shades? how "slow" is the transition from light to
darkened? in a dark room with a bright monitor will they "switch on and
off" as i look at and away from the screen?

finally roughly how thick (in mm roughly) would a lens fitting the
above prescription be, for both plastic and glass?

cheers.

--
snowblood (at) bigfoot (dot) com