I discovered some quite easy jobs with plenty of look that you can make for little cost.
Complex Box Plans - Woodworking Plans and Projects | WoodArchivist.com
A_Chronoturret_1 by TugoDoomER
patrol bot 2 by TugoDoomER
Turret by TugoDoomER on deviantART
env obj 53 by TugoDoomER
env obj 37 by TugoDoomER.deviantart.com on @DeviantArt