hi there Patrik
looks like a nice clean simple design

before you commit to buying parts it may be worth pricing up the difference between using supported rails all round and fit two dives on your X axis (long axis)

money is obviously a big issue, however, the difference in performance is very likely to make it well worth the extra expense

lets say it would cost you 20% more... the machine will likely perform 80% better... in reality it is hard to quantify but you will find that most users on this forum would urge you to go that little bit extra in making sure the machine will put a smile on your face every time it spits out a nice accurate clean part