Hi Tarashon!
Thanks for the quick response I'll put in further proposals as per your points below and recap on them in the end of the post. Thanks in advance for reading.
Tinkerer
The new proposed pre requisites for tinkerer:
Alignment: Any
Feats: Skill Focus: Craft Trap, Skill Focus: Search
Skills: Lore 4, Search 4, Set Trap 2, Craft Trap 4,
Old Class Progression:
1st +0 +0 +2 +2 bardic knowledge, bonus feat (curse song, favored enemy)
2nd +1 +0 +3 +3 Deneir's eye, sleep
3rd +2 +1 +3 +3 cat's grace, Tymora's smile
4th +3 +1 +4 +4 eagle's splendor, Lliira's heart
5th +3 +1 +4 +4 bonus feat (curse song, favored enemy), craft harper item, invisibility
New Class Progression 
1st +0 +0 +2 +2 Bardic knowledge, Bonus feat (Favored enemy)
2nd +1 +0 +3 +3
Craft Acid Bomb
3rd +2 +1 +3 +3 Cat's grace,
4th +3 +1 +4 +4 eagle's splendor,
Craft Fire Bomb
5th +3 +1 +4 +4
Freedom (Permanent Freedom!), Invisibility
6th +4 +2 +4 +4
Craft Electric Bomb
7th +5 +2 +5 +5
8th +6 +2 +5 +5
Craft Tinkerer Potion
9th +6 +3 +5 +5
Imbue Weapon
10th +7 +3 +6 +6
Assemble Scrap Golem
Q&A
Question:
"I would like for you to come up with more for this class and how many levels it can have - also i think this sort of beckons for a tinkerer golem of sorts , ie a special summon - allready have the model in mind."
Answer: I think with your feedback, We could actually make a ten level prestige class, Ten levels is a suitable investment into a class and I feel with whats proposed above its worth the investment.
Question:
What i wonder about is how these bombs works. are they basically alchemist fire only cast'able on ground or ?
Answer: Whether its by feat or widget (Plot item, Non transferable) is that bombs can be spawned into the players inventory to use (Or produced so the Tinkerer can be a merchant to other players). I thought of two ways:
Spawn Acid and Fire flasks via widget (or feat but I think thats harder), Which are already in the toolset,We could make the Electric flasks similarly to how the acid and fire flasks are scripted. Acid and Fire flask info here:
http://nwn.wikia.com/wiki/Acid_bomb http://nwn.wikia.com/wiki/Fire_bomb
We could put in effects on a "bomb" produced by the tinkerer, So alchemist fire is definitely suitable, Possibly acid fog in acid, Fireball for fire and Chain lightning for electric.
Question:
"Also, obviously, how do we scale power to a class only ment for a few levels so as to actually work on all levels ? perhaps that it has 6 levels to it but all levels of the given char scales the bombs and summon etc ?"
Answer: To scale correctly on Alangara, I think it would be worth scaling with character level for sure, Really good point made.
New Features Proposed
Craft tinkerer potion; This can be a selection of 3 to 5 potions with effects on each. Examples can include (These are just ideas off the top of my head):
Mage armour
Haste
Improved invisibility
Endurance
Bulls Strength
The cost for the tinkerers potions would be 1500 gold per person. This can be emulated via a widget gained at level 8 or scripted as a feat. Whichever is more advantageous.
Imbue weapon; The tinkerer has worked out the different chemicals/compounds that can be applied to give a temporary effect, Examples are as such:
1d6 Cold
1d6 Acid
1d6 Fire
1d6 Sonic
These effects should not be stackable for balance reasons.
Assemble Scrap Golem; What appears to be a hunk of animated parts, constructed by assorted scrap materials, parts and machinations stand as an ultimate labour of love for the tinkerer. Animated by the expert eye of a master tinkerer. It abides by any command that its owner provides it.
Would love to expand more on the golem, Though it appears you might have an idea already on that one.
