Hi Michal,
The wheels look really good I must say.
Keep a good check on the wheel nut torque settings each time you come in. If the wheels are brand with inserts they may take some time to settle down with hard use. I use 108Nm torque on my alloy wheels.
Tyre pressure as per Matra reccomendation at high speed. 2.1 bar front / 2.5 bar rear, even with the bigger wheel size. Keep checking these pressures each time you come in also.
Remove the car jack/handle also and absolutely everything that is loose in the inside the car.
Don't know if you have enough time, but 1.5 deg negative camber on the front will help, by adding extra shims at the top of the suspension mounting.
The rear plexi-glass will need a support of some kind in the middle, as it will bang like crazy otherwise. See pictures below.
The passenger seats I would personally leave in. They do not weigh that much and it will detract from the cars unique seating arrangement, which is one of the main features that I find catches the publics awareness and appreciation of the cars anyway.
You may also consider using an additive to the petrol, such as Millers Oil Motorsport competition Valve Lubricant and Octane Booster for more engine protection and supplying the right 5 star octane the engine was designed for anyway.
Have a great time and enjoy the left hand corners, but take care on the right ones!
Cheers,
Graham