G'day Heli-ice
The seats definatly will not fit unless you change the tracks. These are completely different and would normally require an engineering order to change over.
As for the linings, the new one piece roof lining is a pain for maintenace as access for cable inspections is difficult. For the window surrounds there are after market mouldings available, these are normally pretty good and about 1/2 - 1/3 the price of genuine Cessna ones.
Good Luck