Howdy Ken, guys,
UHU is good, and really anything that will give a good even coating will work, Some people use the adhesive aerosols. I personally have even used wood glue when I was out of everything else and I knew that it was not going to be in an area that would show.
As for thicknesses, well, card models are forgiving for the most part, getting as close as you can get is usually good enough. and again, if you mess up a part, you just print anopther part out and work from there.
If you dont like the colors of a particular model, you can take it to a photo editing program and change the colors. For the most part, nothing is an "Absolute" with card models.
Now when you get into internal formers in aircraft, and you have to use a strip of paper around the former to glue the "aircraft skin" onto, then thicknesses are abit more important and I guess that could be said of ships internal formers also, but, not being a ship builder myself, I havent dealt with that problem before.
So, get as close to the thickness as you can, use whatever adhesive works best for you, some people just work better with certain types of materials including glue.
If you have any more questions feel free to ask, I may not be on at the time, but I will respond to any question I can answer..... and even some I cant answer lol.
Have a good day,
Greg aka GW
ps, if you want a more widely varied answer to any questions on cardmodels, visit
www.cardmodels.net They would love to have you there and will answer any questions they can. I am currently trying to show modellers from each site (this one and the other) that the members are welcome at both sites and each site has something to offer the members of the other.