Here are some thoughts. First, the lack of information, such as how to assemble the fuel tank, is one of the drawbacks of the cheap generic ARFs that come out of China. The planes that are built for companies like Great Planes, Tower, Sig, etc come with better instructions because the companies insist on including them. Anyway, that doesn't get you past your problems, so let's move on to them.

First, here's a link to the assembly manual for the Tower Trainer: http://www.towerhobbies.com/products...1110manual.pdf . I realize this is a different plane, but it will show you some details on how to assemble the tank, and many other helpful things that are probably not in the manual for the plane that you have. The best part is the pictures are clear because it's not the 100th copy of a copy like often comes with the generic ARFs.

Now let's move on to the engine related questions. You say you're in China? Out of curiosity, what part? Is this temporary? How long until you are back in Canada? Do you plan to learn to fly over in China, or wait until you return to Canada? If you're going to be in China for a while, you might want to update the location in your profile, or perhaps add a comment about it in the signature section of your profile so people know you are in China rather than Canada. Is the $600 price what they charge the locals, or just the lao wai's?

If you do not intend to try flying while you are in China I suggest you not even attempt to find a prop, mix your own fuel, or run your engine. There are safety and tuning aspects to running an engine. While it's possible to do them on your own, they are really best learned in person with someone who has done it before.

Mixing fuel is easy, if you can find the right ingredients. All you need is oil (not just motor oil), methanol, and nitromethane. In the US, there are plenty of sources for these ingredients. Finding them in China may actually be harder than buying premixed fuel. Trying to buy them in the quantities needed for a gallon or two will also be difficult. Most people who mix fuel do it because they burn lots of it. Anyway, there are many different ratios. Somewhere arount 18% oil, 5-10% nitromethane, and the rest methanol will work. Some engines will even do ok with no nitromethane. However, there actually are places in China where you can get airplane fuel.

A .46 engine would typically take something like an 11x6 prop.