Tail light / Brake / Signal Combo

[3Ds]

Hello all,
I am just a dabbler in these things electronic but hope one of you might help me.
I am restoring a antique pickup which has a 6 volt [u]positive[/u] ground electrical system.
I've machined new light inserts which will receive leds instead of the old dull 6 volt bulbs.
I would like to use one set of leds in the rear housings and fire them differently whether using the running lights, brakes or signals.
I've attached a proposed circuit and I hope someone would comment if this looks ok or I need to make some changes.
For instance, I am concerned about how powering the coils of the relays in the back lights might affect the front signals.
Thank you very much in advance.
Brad

[3Ds]

Oops, I have changed my proposal as I hadn't supplied a circuit to the signal lights when the brake was not on.
Thanks for looking,
Brad

[3Ds]

I have changed the schematic once more just to make it a little clearer to me.
I'm pretty sure I'll need some diodes in there somewhere but it's confusing being positive ground.
With all the switching, I would think maybe some snubbers?
Thanks,
Brad

[Syncopator]

Brad, it looks as though the park light switch is the only way that the tail lights are lit unless either the brakes are applied or a turn signal is initiated.
Is that correct?
Aren't the tail lights supposed to be on when normal lighting, i.e. headlights, on?