Using Reeron's 2.13 Spell/Feat/Class fix pack I have created a nice build for those itching for a bow-wielding Eldritch Knight / Harper Agent. He has Point-blank Shot, Weapon Focus: Longbow, Power-Critical: Longbow, as well as Practiced Spellcaster, Negotiator (for Reeron's 3.5E fixed Harper Agent) and Able Learner (to fulfill the rest of HA skill pre-reqs), Weapon Proficiency: Martial, and Weapon Finesse (for when you absolutely have to use a melee weapon).
Drop the .BIC files into your \My Documents\Neverwinter Nights2\localvault folder, and start a new module with no level cap to view the level 20 version.
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Update 2: I've made another one that's 6/10/4, so gets another attack per round from BAB +16 instead of BAB +15.
I made a new build, 6/10/4, BAB 16 (4 attacks instead of 3 with BAB 15), and level 9 spells. I should note that both of these builds are done with Necromancer school specialization for Wizard to get the extra bonus spells per spell-casting level.
A level 1 to get you started if you think you can tweak it better, and a level 20. Created using FRW Character Creator, so the level 20 version has a more full array of spells (than a stock 20) and some basic gear.
10 - A Masterpiece, Genuinely Groundbreaking 9 - Outstanding, a Must Have 8 - Excellent, Recommended to Anyone 7 - Very Good, Deserves a Look 6 - Good, Qualified Recommendation 5 - Fair, Solid yet Unremarkable 4 - Some Merit, Requires Improvements 3 - Poor Execution, Potential Unrealized 2 - Very Little Appeal 1 - Not Recommended to Anyone