I took a look at the file and it wouldn't be a huge project to cut the part.It would be helpful to have a little more information of the type of plywood if there are any special requirements.The sad thing is that from a British perspective-and this is primarily a British focused site-sending goods to the EU is more complicated than it used to be.
This gives some of the information https://personal.help.royalmail.com/...g-items-abroad . It also isn't a particularly cheap thing to do https://www.parcelmonkey.co.uk/international/romania .

You might find somebody nearer Romania if you post something similar on https://www.cnczone.com/forums/ as it is a more International site .It certainly seems to be an interesting project and I wish you success with it.