Recently I've been thinking of picking up NWN2, and before starting out I decied to experiment a bit with the NWN2 Builder to see what sort of a character I would enjoy playing. However, I'm afraid am not very familiar with some aspects of the implementations of the 3.5 ed ruleset (I have some idea about the rules as I have played games like IWD2 and ToEE, but I really don't know much about PRCs for example)

My questions are, regarding arcane spellcaster builds: if I stop taking wizard levels and start taking, let's say, Eldritch Knight levels, how would my spell progression turn out? Would my character continue gaining spell levels as a normal wizard? And what would be my overall casting level? Is it very important to take the Practiced Spellcaster feat in this case, or is that only neccesary for caster/non-caster builds?

And one more thing: (I swear this will be the last question in this post) when I max out Eldritch Knight lvls - and provided that I kept progressing in spell levels as a vanilla wizard - and start taking a 2nd PRC like Pale Master, will my character keep progressing as normal? I am aware that PM has a somewhat slower spell progression than the vanilla wizard, but my point is that if my wizard 5/ek 10 stops at spell lvl 7 (that might be inaccurate) will the PM continue to progress on to 8th-9th level spells? What will my final caster lvl be this way?

Thank you for the answers in advance, I am sure I overcomplicated this, but I just want to make sure I don't mess up my character and thus my enjoyement of the game by picking the wrong PRC.

Difficult essentially will come down to group tactics. If you pause the game and issue individual orders to each party member you should find it relatively easy. In particular, the game drops the strongest melee NPC right at your feet near the beginning of the game, so a spellcaster PC has a reliable meat shield from the word "go".