You can do a gti-r brake conversion which will be sufficient
I'd go for a coilover setup too. Easy to do and have more flexibility with setup optipns
Your driveshafts will have to be a custom job. Either two cut and welded together or a set especially made
A subframe from a donor car or scrapyard is your best bet for front and rear mounts
Engine and gearbox mounts are another custom task
There are some build threads/blogs on here of sr20 builds
