The ROTAX 915is has liquid cooling that is routed to an automobile type cabin heater , The nice thing about this is forced fan air is available in the summer as well for ventilation. The aft mount was supposed to have pre-drilled holes but I had to measure and drill on the C channel support in place... a little awkward. The NACA ducts were riveted in place with SIKA Flex . The aircraft has a ducting channel for air to the rear seats so I started the sealing process for that duct by adding foam blocks to form the aft portion of the channel and applying Sika Flex for the seams. I added the OAT probe to the pilot side of the NACA duct. The kit comes with aluminum type dryer duct. I decided to go more standard aircraft ducting and I will install the next build day