Sorry for using a comma - English is not my first language I meant first one and a half to two years. You will need a big shed did you consider any smaller species?Space, yes. But his ability to be outside will be limited to summer months with a heated hide box. Where I live, it's below 50° outside from October to March. We only get warmer summer weather from May-August, maybe into September if we are lucky. So I will need to build a suitable indoor enclosure as well, as the leo will be spending at least a few months each year indoors.
And I am sorry, did you mean years 1-5, or 15.5 years foe the growth rate?