Hello,
you are probably still missing the incidental purchase costs for your property (notary, land register, etc.).
The iPAD you receive includes the installation instructions (according to the provider’s homepage). From this, I conclude that you have to install the items listed under expansion package 1 and 2 yourself. Can you do that? I wouldn’t trust myself to do it, or rather, I wouldn’t want to deal with the delay. In my opinion, it will also be difficult to find craftsmen who will install the delivered material according to the specifications in the iPAD instructions... In any case, your budget will become tight.
Moreover, the earthworks are not included. The costs for that can only be estimated after a soil survey.
Best regards Jochen