I'm going to do a playthrough of Morrowind for the first time in 8 years or more but before I do a "proper" playthrough which will involve me levelling up properly I'm wondering what are the maximum possible stats attainable without enchantments, glitches or hacks? I want to emulate these stats with console commands.

I have heard that this is level 78?

I'm assuming then that all Major, Minor, Misc skills and attributes would be at 100? In that case how many "points" would I have to divide between Health, Magicka and Fatigue?

Basically I want to create a character exactly as they would appear at the highest "legal" level but with console commands.

This is easy in skyrim because the player.advskill allows you to increase skills naturally one point at a time whereas morrowind only seems to allow you to enter what number you want a skill to be at.

Any help is greatly appreciated.

Maximum level depends on your class/race. If you make a character whose specialized skills and racial skill bonuses are all major/minor skills, their maximum level will be lower than if you have a character whose racial skill bonuses and specialized skills are all misc skills. The reason is that you level up every time some combination of major/minor skills go up by 10. The skills are capped at 100 (assuming you are not using an uncapper mod), so the higher these skills start, the less skill levelups there are to go towards levelling your character.

If you want to find out what the maximum level of your character will be, you need to add up the starting values of all you major/minor skills and subtract that from 1,000, then divide by 10 and that is how many times you will level up, so then add 1 (since you start at level 1) and you will have your maximum level for that character.

However, I think if you max all attributes to 100, your character cannot level up anymore, so could potentially reach an earlier maximum level. I am not really sure about that since I have never maxed all attributes.

I have to ask though, why do you want to do this? Morrowind becomes trivially easy with a high level character, so I do not think the game will be much fun if you start out with a character at amximum level.