Gun Powder Based Hero Ability Help Please

Hi, I am trying to make a hero whos abilities are gun powder based but im haveing a little (alot really) trouble getting my desired effects.

The character model will be the Marine and will have standard michine gun attack.

Here are the abilities i want him to have:

1) Overpacked Shells - This will just do bonus damage like searing arrow.

2) Napalm - I want this to be a combo of mortor team artilary shell and flame strike. When the mortor shell hits the ground i want the flame strike to start.

3) .50 Caliber Rifle - 1 second cast time; instant missle; 150/225/300 damage per level; 15 second cool down.

4) Placeable Missle Turret - I want this to be like a Serpant Ward but i want it to have the human Seige Engins Barrage abilitity but i want it to hit ground units also.

The first ability i think is gona be easy so dont worry about that one, but if you have any idea how to best make these abilities.

Thanks Ahead Of Time.

Have a spell with the matching projectile art and use a wait, but unless you have a set min/max range, I can't really see how you'd get an exact time.

Yeah i figured i would have to use triggers to get these effects, but im not a pro mapper (specially in the ability department) so i thought i would post it to the forums to see if anyone had any good ideas they could lend me. w00t.

I think an invisible unit firing a mortar is the best way. Add burning oil to the invisible mortar team, try changing the effect to flamestrike. You could also take a look at plauge ward, because that creates a unit when the projectile hits, the "plauge ward" unit can then be ordered to flamestrike itself, but I think that modified burning oil is better because plauge ward solutions are quite complex.
This should be doable in the object editor, just create a copy of barrage and change the targets so it can hit ground. Also remove the tech-prereq.

Just modfiy fireball, remove stun and add casting time

Is that a campain unit skill or a melee. Who uses that skill normally? It doesn't ring a bell.

I will do a 'find' for it though when i get home. U c im at work now. Shhhh don tell anyone im posting durring work. LOL.