dude you should realy upgrade hextech gunbalde into a Will of the Ancients. it is like a awesome item. you get 80 AP for almost nothing and you get some good spellvamp. and the best of all of this is that 30 ap and the spellvamp also contributes to your team. test it to see if it goes better in your build.

Definitely Will of the Ancients for the win over gunblade. If it were me, I would either buy the Catalyst of the Protector after starting boots so you have it for laning phase, then upgrade to the Rod of Ages right after the Hextech Revolver, or just not get it at all. By the time you can afford an Abyssal Mask, the game's either almost over, or it will end before you can get the max benefit from it. Other than that, the masteries and runes look good and if the skill order matches your playstyle, then it's a pretty decent build.

The Hexetech revolver does have some cheap AP. But, that is not the most important part. The 15% spell Vamp means all the spells you do have an extra 15% Vampirism! This use to not be very important, but since they (LOL) have nerfed drain, it is important to get that spell vamp back.

Also, for the good hands, I don't really use it, since I don't really die alot as fiddle. If you really feel you need it, go for it, but it is kinda usless since I spend about 5-10 seconds dead.

For Mastadog, Perserverance is not my first choice, but to get farther down the tree it is needed. If you spend the points on haste, you'd better be using ghost, and if you youse it on spatial accuracy, you better be using teleport. I chose Perserverance because utility is the tree I am using, and to get down it, I need to spend a specific amount of points.

Also, thanks for the exhaust suggestion

see above. will would be much better than the gunblade. also, the most memorable and best set-up skill of fiddle is his 3 second fear. it needs to be leveled first. your ROA needs time to grow, get it earlier. and why don't you have Cripple for your exhaust? you really don't want that crit chance. and the second worst mastery out there is the +base mana. perseverance is the worst.

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Hextech is sort of MEH to me. Fiddles doesn't benefit at all from the AD or lifesteal. I feel a Will of the Ancients for the team help is better.

Also, imo. Good Hands > perseverance. the extra revive time is priceless, while health regen is useless due to Bountiful Harvest and mana regen is easily found elsewhere.