If we talking about suspension travel its depends on setup- we doing only tarmac version- not gravel. But 180mm its good value for the start. On Rally2 Fabia rims has 23 of offset, we do 30-50mm. Caster between 3.5-5° its good value for road cars 😉 In these monsters there is between 6° to 8° of caster. Base length of lower control arms is about 500mm. Longer it gets - more camber you have, so its not constant value. Springs which are in use has from 35N/mm to maybe 70N/mm. For canarias with so grippy asphalt they using 6kg, on more slippy surface (wet, cold) they going on 35-40N/mm. That's all information from SRT. Remember that we are doing tarmac spec- we are not driving on dirt/gravel like prymitive animals (😛)
Tires is very hard to understand. LFS don't have nothing like rally slick tires or semislick tires. Only full slicks or shitty road tires (something like uhp ones). In Michelin manual we could see the real width of tire is 210mm- that's suprisingly narrow tires for 18 inch wheels. We can apply that on slicks and we get good grip but also very rapid changes in traction which are so much pain when you do handbrake turn or popular donut. Its practicly impossible. That's why we go for 235 road super tires. It has good grip and allows to drive without rapid changes of traction and everything happens smoothly. Why so much width? Because narrower tires cant handle this car 😁