Was wandering u could do a Reserved slot type thing where if the server is full and a Builder or above trys to join it will automatically kick a guest...
or something like this?

Reserved slots would be for Op+, and could be possible, however it would not randomly kick a guest already in the server. Instead it would refuse connection unless the user was an Op or higher. However this is the wrong forum for this, since it's in the server software.

/moved

Agreed. Not only would it directly benefit me , but it would help keep guests under control when there are 24 of them in the server wrecking havoc.

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And also adv builder? cause what if there are no ops that are up / at there house/ cabin i could join if its full

No, Hops+ only.

Don't forget that advbuilders can only tempban and kick (for now, those powers will be lost during the new ranks change and given to higher ranks), whereas hop can at least permaban, and will soon be able to undo actions in the next software update.