The Trent 900 is an easy build and only took a little over an hour to complete. Although made from PLA, the 3D printed parts look to be made of metal. All of the parts fit perfectly and there was no trimming, gluing or painting required. The lighted exhaust and motorized engine worked as designed on the first try. I am very pleased with this kit and look forward to new similar releases of high-bypass turbofans...perhaps RR XWB-84 or -97, the GE90 turbofans or even the smaller GE LEAP or P&W Geared Turbofans?