Hey U_K
I was wondering about something...
I'm thinking of using your system to figure out some sort of alternative leveling system that I think my players will love. I know there's probably already some similar kind of system out there that has something like this already.. I just consider it a challenge to make it work by doing it myself (so I can brag with it to my players, or whatnot.

)
It's like.. you're not tied to a certain package of levels (no actual classes and all that, just the abilities to pick from.. all need to be explained for of course), instead you 'train' in certain things (or you gain XP and put it into learning certain abilities..or both..er..). I was thinking about letting 0.1 CR cost 100 xp (once the character has gained enough XP to level up, everything will cost twice as much as at 1st level, at 3rd level, everything costs 3 times as much, etc..).
Let's say...they want to learn a feat/special ability, so they find some way to learn it (by finding a teacher, by training on their own, by going through a magic ritual...depending on the ability really). They want to gain skill points, so they train in a similar way as with feats (with a maximum per skill depending on their character level or something like that).
The only real problem I'm having, is that I don't know how I should do the HD related stuff (HD, BAB, saves, etc). I'm not sure how much CR to charge for, let's say, 1d8 (therefore I don't know how much XP they'd need to increase their HP and such).
Now that I think about it.. I guess I should just charge them for every individual attack bonus and save bonus, just like I'd be doing with skills..
Ok, I guess I could figure some stuff out for myself if I actually think it through for a bit *smacks himself*.
How much CR would all the HD be though (d4-12)?
Judging from the cost of a feat equivelant ability, 1% would be 0.2 CR, right?
Do I divide the % of the HD by 20, and multiply that by 0.2? (d8 would be 0.15 CR then, or 150 XP times character level) Or would it be something different?
Not sure how workable I'll be able to make this.. but it'll be fun (for me as well as my players

).
Something that worries me though... I'd have to use normal classes to make characters on the fly (grunt NPCs etc).. Do you think this would be ok? I guess the classes would simply be preset packages..or something like that.
Hmm... Now that I think about it. I guess a player could opt to wait with spending his/her XP to 'purchase' a level in a certain class..
It's still a fresh idea..so it's kinda mindboggling for me at the moment
*looks at all the stuff he typed*
Hmm.. I wonder if I really had to type all that much about it to get the point across
So.. The questions would basically be.. How much would one dice of HP be worth for one level, and maybe some advice if you can think of anything
Edit: Wow.. Must really be tired or something..
Make that "divide the % of the HD by 20, and multiply that by 0.2?" "divide the % by 100?"
Edit 2: Oh yeah (yes, I think I am a bit too tired to think straight

) I was getting confused how to calculate the CR of the HD because the class feature thing had 1% for every feat equivelant ability. This told me 1% would equal 0.2 CR.. But then the rest wouldn't be correct (like HD, BAB etc).