I am going to try and change the carry capacity from weight to available space.
Like instead of you not being able to carry lots of stuff because you don't have available room.
Things you are using like armor and weapons won't take up space.
So I am wondering before I try this will it be difficult? I'm very new.

Skyrim>All.
OT: I don't get it, weapons are not heavy?

It will be difficult if you are new. You should have a more detailed plan as well before you start. How are you going to determine size of objects and how is it decided how much space the player has left? Do you use a categorization system (S, M, L, XL, etc) or do you want to figure out the actual bounding box of the object? Do you want to make "slots" for specific item types, i.e. you have 3 slots for potions? Special bags for item types perhaps?

Hmmm.

One way of doing it is to give all unequiped items four times as much weight.


The lazy way I've done it is to change the carry amount of 300 to 100, by using console commands. "player.modav carryweight -200", if I remember correctly.

First, I think it's a great idea!

How easy or hard is totally subjective though - new or not. If you are up for a challenge, I would say it's doable. I think both Richard8844 and Maegfaer have good points too... so maybe a combinatin of weight and space.

On a technical level, modifying the carry weight is pretty easy. The challenge will be as Maegfaer points out - how you will determine the size/space. If it were super easy, someone would have done it already. I would use this mod though if you finish it.

I think I will use the S M L XL idea
I like potion slots to
Maybe carry around a loot pack that goes on your back and it Caries stuff like weapons armor scrolls misc and anything that isn't slotted like the weapons armor and potions that are equipped.

First you would need to increase the carry weight.
Then, as an idea, add to each item a keyword to classify the volume of it.
Then, as an idea, you can use the OnItemAdded and check what keyword it has and add a number to a global. If the global value reaches a maximum the inventory is full.

This could be one way without using SKSE. I am not familiar with SKSE so there might be an easier way. I also don't know if items already have keywords you can use and thus not adding new ones. For example if pots all have a potion keyword you can use that and just say all pots take up the same space.