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Raui,

From what I have learned so far is is solid copper is best, but coper tubes will also work good. I have tried steal rods, aluminum rods and coper tubes as well and also mixed them. They all work...but I like the copper solid rods best but the coper tubes also work. Personally if I was going to do it again the aluminum rods are very close to the copper rods.

The biggest variable is the spark gap ... that is where it all happens. I have used air quench and magnetic and heat. I like the magnetic best. You also need a way to adjust the gap when running...so think about that....Tesla's way is best. I use a long wooden screwdriver to adjust mine...but I can not recommend that to you...

you don't need very long bars .... 2 feet tall will work just nice mine are 4 ft tall.

I have not tried to change the caps yet....so I don;t know what different sizes will do..but mine are 40 KV .002 uF I think.

I would make them just like Tesla did with to flat plates spaced apart ... and maybe use glass or Plexiglas to make sure it does not jump the gap.

You need a good transformer. I think that I would not use any less then 7 KV I think that 20 would be better, but don't use more than the caps are rated for...

Make your stand steady...you don't want anything to move and you need good stable connections. This is high voltage so you need to make is safe. This stuff can relay hurt you. So dubble check everything. Have someone there when you use it just in case you have an awakening moment.

Standard bulbs will not last so use Halogen bulbs. They will last a very long time.

Good luck

Karl