I would not consider a turbo engine for a UK Mr2 rally car as this puts you in the same class as the 4 wheel drive WRC cars and the like that are widely used these days. Even on the smallest club event.
Stick with a 1600 engine which is still a hotly contested class or if you want to go 2000 but then you would be up against the Mk2 Escort boys who build some crazy monster machines.
Many years ago before the WRC cars (hence my screen name) I did some single stage events mostly tarmac in a variety of cars Mk1 Escorts a Lotus Sunbeam and a Porsche 911. However when I got to the point of destroying a set of tyres on each event just to stay competetive I gave up.
As far as suspension goes look at Techno Toy Tuning in the links below.
https://technotoytuning.com/toyota/a...-rods-aw11-mr2
https://technotoytuning.com/toyota/a...-1989-aw11-mr2
Also talk to AW11rally as he has a similar setup on his car with adjustable length TCA's etc.
His car was built by a guy I think called Steve Woodcock and the suspension parts were developed by a firm called Trans Sport I think based in Preston.
Unfortunatly they went out of business some time ago.
A further note on the use of fibreglass doors, There are as far as I know only a handfull of cars that can use them, these being the Lotus Elise/Exige the Vauxhall vx220 - fibreglass body shell and classed as production cars and all the variations of the Darrien range. The Darrien is classed as a specialist vehicle and the rules behind this would take up a thread of their own to explain.
Also have you seen this 222d replica build on Facebook
www.facebook.com/TTE222D/
again not eligible for a logbook under current MSA rules as it has too much of the bodywork removed and the suspension pickup points have been moved.