I remember when I cast a part for one of my piers...a lot harder than it looks and I have never been so proud of one of my achievements...but if you have the time just look at what is possible using the same humble technique that I employed but on a greater scale...
There are quiet a few of videos similar to this one showing how it is done in places where health and safety is an unknown concept.
https://youtu.be/Bzy6GLKmd3M
alex