Using either spaces or miniscule letters, is anachronistic for both classical Latin and Greek. They only had a single case in antiquity and didn't usually mark word boundaries.

For example:

https://en.wikipedia.org/wiki/File:Trajan_inscription_duoton... (Latin as typically carved in stone)

https://commons.wikimedia.org/wiki/File:Herculanean_Rolls_-_... (Greek as typically written on papyrus)

Sort of. Romans didn't handwrite like that. See https://en.wikipedia.org/wiki/Roman_cursive . Note that the "u" character in both ancient and late ancient Roman cursive is more like the modern "u".

(Source: not an expert in any way)