In modelling patience is the most valuable commodity. Take your time. If you attempt to rush things you will only create mini disasters that could lead to massive disasters.
Gluing is via super glue unless stated. The gluing of polyurethane to polyurethane with superglue is ALMOST INSTANT. Be careful, have the alignment and positioning correct prior to applying glue. When applying glue use as little as possible. On a small piece of plastic sheet drip some glue - use a pin to collect a tiny droplet and apply where required. Let set and test. Using the least and possibly needing to repeat the process is better that flooding the join with glue.
When positioning weatherboard wall iron roofs make sure the angles and cover is flowing in the correct direction.
If walls, panels or other items are warped hot water and cooling under compression will restore to the position required.