IVECO 49-12, built in 1994, what do I have to pay attention to when buying

Hello IVECO specialists and campers, have found in my search a WOMO with the following characteristics: IVECO/FIAT I The chassis no. starts with ZCFC498 1st hand, KM stand < 60,000 KM. Since 2014, after the TÜV approval, the WOMO has been deregistered Alcoves, rear drive/twin tyres, built in 1994, AHK 3.0 to engine: 2.5 liters, 85KW at 3,800 U, transmission: 5-speed curb weight: 3.6 To, Zul. Total weight: 5.0 to Construction: Multi mobile, roof and walls from GFK 1 solar module, Kathrein rectangular antenna last TÜV in 2014 with the following defects: Differential, transmission and engine have low oil loss. Plaque has been granted. Conversion from red to green badge should be possible for approx. 5,000€ Desire: approx. 23.000€ What should I pay special attention to during a visit? Which wear parts, except oil/filters must be changed regularly? What about the suspension? How long does a gel battery last? Where are the typical flaws on the body? the rumors are running that a spare parts supply with regard to body parts becomes difficult. I would be very grateful for answers, also about expected costs with regard to the oil losses complained of by TÜV.