Hi, Toshi -
First, I agree with the others, your 'Spad is your best yet. Loved it.
Second, I'm not 100% certain about the Testors Clear, but I think it may be for attaching parts like canopies. If that is the case, it would provide only a non agressive attachment of the surfaces, like Elmers would. For a permanent, strong bonding of the mating parts like the fuselage halves, the Tamiya Thin would indeed "melt" the surfaces together, in the manner of welding metal.
If you wanted to, you could indeed airbrush the fuselage, either one half or the whole thing. You're quite accomplished at masking now, I think it would be well within your ability. Looking forward to seeing this one progress.
Thanks, Toshi
Patrick