Hi Zooma
I started making model planes from kits in the mid50's and soon learnt that banana shaped models didn't fly well. A sturdy flat building board with a prominent centre line was essential. When I started building model boats I applied the same principles and made sure the keel and formers were all firmly attached to board and equal distant on both sides.
I agree the material and cutting left much to be desired but to me that was part of the fun as if I checked and corrected the errors by fettling or replacing the faulty parts the model became mine.
Nowadays we have kits that are produced using accurate laser/water jet cutters and if the designers have done their sums correctly and checked the finished result the process is now much similar to the plastic kits from years ago.
That said I would still check all parts with a dry run as some will need fettling in some places.
Sadly many of my fellow club modellers are not builders of models and prefer to buy second hand and just make them look nice. There are still some scratch and kit builders but if we do not inspire the young at an early age the learning curve becomes more difficult later in life.
dave976

Have built several models from plans.
I always check accuracy throughout the build by reversing templates, then using measurements and squares etc.
The moment of truth is when the frames are all built up, draw around the bulwarks. Turn the model over and, if lucky, the two silhouettes are similar.
If not, this is the time to investigate and rectify before it is too late.

Having bought several vintage/classic model boat kits over the years, I have often had to replace some of the old warped parts.
After drawing around the original part and making an accurate template, I find the centre line and fold the template to reveal any disparity (between left and right) - and the results are often quite surprising.