That is tough! I thought we had it pretty bad with all the engineering rules, compliance inspections etc, shouldn't complain reallynice project , congrats !
i envy you guys at Australia and the US ? ... here we have a annual tech inspection which does NOT allow engine swaps , sure not subframes/steering mods .... yes , once 25 years old cars got one final tech inspection and can be "oldtimer" ... so we could do some things..... but they are changing that , car must now be 30 years old and again also tech inspection every 2 years. So i think many will have problems.... and have to go back OEM.... in the rally car i had a M S38 engine , i already went back to a M30.... those fantasies will be over in the next years.