More build Questions Precondenser and Condenser (CCVM)

[tiramisu]

CCVM Column,
Assumptions
3" Column, 72' height
5500w max heat
3" Tee with a 6" spool on top of that ( so 9" to the top of the column head )
3/8" copper refrigeration tubing for precondenser coil
Shotgun condenser

1. Heating Assumptions - How many watts can I put into a 55 liter beer keg before it is just a puking mess?

I know you can heat it up at full power but how much do you have to pull back on a stripping run?
- I would like to use a pragmatic measure to get to my condenser questions.

2. Pre-condenser - How big a coil do I actually need to put the still into full reflux? how long?

Couple of questions embedded in here.
How much copper am I likely to need. 50' in a roll - 10', 20'

The top of my still head is about 9" from the top of my still.
The coil would have to be at least 12" long to completely obscure the column head.
How far past that do I need to go to get to full reflux?

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3. Shotgun condenser

When I use the calculator on the main site with 12mm ID requires 162" @ 5500w
With 9 pipes that is an 18" condenser.

Is this overkill? Should I be estimating with something closer to 3k or even lower? (assume stripping run).

3x12' (432") lengths of 1/2" type M makes a 9 pipe 2 foot condenser (216" which is even sillier)
2x12 (288") 6 pipe
1x12 (144") 3 pipes

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Thanks again guys.