Concerns about Heimerdinger

Hey there, I wanna talk about the current state of my favorite champion and some tweaks he really needs atm:

1. Make his passive scale up with either AP or HP, or his own base regen. And allow him to repair towers again, in the form of an ability like Azir's passive, with a cooldown. Restoring some health to the tower or something like that. If janna can shield towers i don't see why heimerdinger can't repair them.
2. Give turrets back the old magic resist debuff with each attack, not necesarilly to 50 like it was before but 25 should be a solid number. Heimerdinger can't project his turrets, and right now turrets die easily. Fighting in Heimer's zone of control for too long should be punitive for the opponent.
3. Turrets' health should scale with Heimerdinger's own health as well.
4. Turrets should go invisible when deactivated.
5. H-28Q Apex Turret should explode for big aoe damage when destroyed and it's slow should be increased to 50%. Right now it's very easy to deal with that thing.