No problem for the questions, happy to try and answer. Lets start with tubing size, if you want 1 it has to be 3/8". I tried a 1/2 and that was too much air and two 1/4" was not enough air. That said those were experiments in vinyl tubing as tests so they may have kinked. A single 1/4" tube will not flow enough air. Unfortunitely you will find where you have to send the tubing you can't get tools. That is why I say use the copper nickel tubing, works with tools but also works by hand.
I posted this in another thread but forget which thread. I would not do it as I did again. I would drill into the main tube and route 1 3/8 line to each bank. You will need to wield something to the exhaust or if you look in the super charger threads they route a oil waste line to the exhaust and have a way to get a tube into the exhaust, simpler than what I did.
For the front there are some fittings that will clamp on and seal to the main tube. I would leave everything as it is, you will have to remove the tube to drill and put the fittings on. Then reinstall and use compression fittings to the tube and the clamp route it back and be done. The tube is a funny size and hard to get something to join to it. It is very thin also so wielding to it might be tough. I don't tig only mig so for me it was not the best choice.
This is what I would recommend it is stainless and the out tube fits right into a compression fitting. You will not find them at a hardware store you will need a place like Fastenal or other industry supplier. They will also have the other things you need.
If you were going to mount to the tube in the front you could likely use this. That plastic is likely good to temps of boiling water.
If you have only a hardware store then you can find these in the plumbing section without the tap.
Even if you are in Cali you are allowed to repair the system so it does not need to stay stock. If some Dumby tries to tell you otherwise point out the system still functions as it was designed the path the air takes is not legislated.