Side strips dont fit, I tried it. The mk1 strips are much longer and the clips are different on the mk1 doors.
i have a mk1 valver and the mk2 parts I have are as follows:
engine
box
wishbones
shafts
hubs
front brakes
rear calipers
radiator
steering rack
pas setup
172 manifold
172 twin barrel cat
*soon*
Seats
door cards
dash
*stuff im looking at in the future*
rear beam and suspension
front subframe
air conditioning
the front suspension does fit but because the top mounts are different its a little awkward a guy on c16v managed to bodge it by using two top mount bearings ontop of each other but im happy with using my williams avo coilovers with the hubs machined to fit.
go check out my project thread and have a look, im trying to get as many mk2 parts on my car as possible due to most mk1 parts being NLA
edit: the front subframe could be made to fit but would require a little bit of chopping and welding, wouldnt be too difficult, im hoping to install the a/c after this too.
oh forgot to mention about the manifold and cat, it hangs quite low so looks like a pair of testees lol! Ill be looking at the 182 manifold and cat as a solution as the cat i have hangs really low and if it fits on a ph1 172 itll fit a mk1 as floorpan wise there only small subtle changes