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Tesla coil anyone with new design ideas? Answered

I am in the early stages of building a new Tesla coil.
After over 10 years without one I think it is time to add one to my collection again ;)

As always I want to stick to to the classic design, meaning except for the HV supply all will be home made, including the capacitor.
No no fancy electronics, just high voltage, a cap and a spark gap...
However, classic must not always mean there is no room for improvement.
Of course you can measure or calculate the frequencies for your primary and secondary coil before even starting to power it up - but where is the fun in that??
My last Tesla coil was driven by a 2KW transformer delivering 25.000 Volts.
This time I go smaller for indoor use and will aim for a simple neon sign transformer with around 3000 volts and 20-30mA output.
Reason for this that I plan to make an Instructable out of it if I find the time and would prefer to use power supplies that can be obtained in most countries without totally blowing the budget.

I did some research on the net to see if there are any significant developments but the only things I could find are in relation to the spark gap or to use a conical primary coil.
For the conical coil I could not even find any comparison to standard flat coil in the same system or a decent explanation why it is claimed to be so much better.
My aim is to go a different way for the primary completely.
Instead of using copper pipe in a standard winding pattern I want to try a quadfilar coil instead.
My early tests on a small scale confirmed that a bifilar coil is better than a standard coil.
For some weird reson the magnetic field reaches further and is stronger while at the same time there is less loss.
So far bilifar coils are only used on some charging pads and "wireless power supplies" for TV sets.
In most induction cooktops, where the benefits would be extra obvious, they are not used due to the higher cost factor of producing them.
Big question here is:
Has anyone experimented with bifilar or quadfilar coils in high voltage applications and is willing share some insight?

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