I think the biggest "problem" of this scroll saw is really the own weight of the saw.....because she has no weight at all.
This saw has only 2kg weight - the next size at Proxxon is the DSH with 17kg.
With this small counterweight, the saw will be not stabile and will vibrate during the use - so definitely you have to fix it - but really fix it at the table. So I guess fix it at a wooden board with screws - and than you have to fix it temporary with bar-clamps on the table.
The table of the saw is with 16cm to 16cm relatively small, the smallest on the market, so you have to decide if this will be enough for your tasks.
also the maximum length, defined and limited by the arm (blue marks), is relatively short -> so if you cut out elements of a POF-frames it could come soon to the limit, because the timber board on which you are working is often longer - but this can be be managed.
As I know, Proxxon advises the user to adjust the height of this counter element to the thickness of the material you want to cut (red arrow) - also an additional working step.
So I think, that this small machine is for some smaller cuts enough. The complete framing of a POF frigate - I am not sure, if she can do it in the necessary quality.
BTW
@janos : Did you check if the angle between the table and the blade is exactly 90° rectangle - very often your problem happens if the angle is not correct!