You say "simple" body runecrafter script, its simple, try make it yourself everyone has so start somewhere.
begin by breaking the problem down into small steps, eg:
- Walk to alter.
- Enter alter
- run to inside alter'y bit
- craft runes.
- run to portal
- exit portal
- run to bank
- bank runes/withdraw ess.
The banking is done very simple by locating your essence and runes at the top of your bank.
The exiting portal is done very easily by using ACA and cts2 to click that, or even if you want a private script just borrow the code i use in my essence miner to exit a portal.
Entering the alter is done in the same way just different color and tolerances.
The walking is a little bit harder, you first need to work out where you are, ie can you see the bank symbol on the minimap? or the alter one? if so then find a DTM somewhere on the path or just walk a direction until you find one that you can use to locate the script.
The walking inside the alter is trivial as its such a small distance and always a fixed direction, you could even use hardcoded distance+direction for this, one like of code for this function.
There you have it, put those functions together with a main loop that realizes where the bot is and what it needs to do next using nested if else if statements and you'll have a near flawless rune crafter. Perfect.