Hey there, I am currently working on a small pack of 4 civs and as complete modding newb I came across few roadblocks 
I would like to ask if it is possible to make those units and if so, does anyone have idea how?:
1) Kheshig - Emperors Guard, can occupy only your own tiles
I was basicaly planning this to be additional unit to the mongol civ im adding, as replacing spearman would quite cripple them on offense. However I have no clue how to set them to be able to move only on your tiles or 1 tile max away from them, if that is even possible.
Also how can I add the unit to be another option when discovering bronze working, instead of replacing the spearman?
Any ideas how could that work?
2) Nomad Caravan - Either a unit (probably using one of the specialist models) that can produce other units, but doesnt allow buying them with gold. - I didnt even bother putting deeper thought into this as I have just no clue how to put this to work.
OR
Unit that allows others around it to heal(fortify) as if they were on friendly territory.
Only way I got this to work was culture bomb effect but that turned out to cause alot of balance issues obviously. I guess Medic specialization on the unit could work but that feels kind of bland. Maybe it would be possible to use general like aura?
3) Hwacha (anti-personnel gunpowder weapon developed and used in Korea. It had the ability to fire steel-tipped rockets or flaming arrow projectiles)
- I was planning to use balista model for this one and use the city attack animation with rockets, would that be possible? Or is there any other workaround for this?
If you have any ideas how to put those to work in practice post your thoughts here please, any kind of help is welcome ^.^

I would like to ask if it is possible to make those units and if so, does anyone have idea how?:
1) Kheshig - Emperors Guard, can occupy only your own tiles
I was basicaly planning this to be additional unit to the mongol civ im adding, as replacing spearman would quite cripple them on offense. However I have no clue how to set them to be able to move only on your tiles or 1 tile max away from them, if that is even possible.
Also how can I add the unit to be another option when discovering bronze working, instead of replacing the spearman?
Any ideas how could that work?
2) Nomad Caravan - Either a unit (probably using one of the specialist models) that can produce other units, but doesnt allow buying them with gold. - I didnt even bother putting deeper thought into this as I have just no clue how to put this to work.
OR
Unit that allows others around it to heal(fortify) as if they were on friendly territory.
Only way I got this to work was culture bomb effect but that turned out to cause alot of balance issues obviously. I guess Medic specialization on the unit could work but that feels kind of bland. Maybe it would be possible to use general like aura?
3) Hwacha (anti-personnel gunpowder weapon developed and used in Korea. It had the ability to fire steel-tipped rockets or flaming arrow projectiles)
- I was planning to use balista model for this one and use the city attack animation with rockets, would that be possible? Or is there any other workaround for this?
If you have any ideas how to put those to work in practice post your thoughts here please, any kind of help is welcome ^.^