Thank you to Julien_DaCosta for the no overhang Moai statue.
I split it in three pieces (and some bolts) so you can print the parts extra large and glue together. Because based on the "Moai statue - No overhang" you will need no support.
For example with the CR-10S scale the parts ~260% and it will result in a ~520mm tall Moai.
(Need it bigger? Use the nine pieces version: https://www.thingiverse.com/thing:3417837 )
Simply scale all parts by the same factor and print the large parts first. Then print one bold and try whether it fits, otherwise scale the bold a tiny bit more or less until it fit. (Maybe the scaling for vertical and horizontal bolts is not the same. Test it!) Than print the other bolds. Depending on you glue there is no need for the bolts.
Maybe sand the (inner) walls before you glue the parts together. Probably you must sand and paint the assembled Moai too. For outdoor usage I suggest to paint it with resin to make it smoother and stronger.
Note: There is no gap between the parts so do not use too much glue on the walls or sand it much more.
I did not test it yet and split it just for fun. If you made a XXXL Moai, please post your Make.