Casting your own concrete blocks/ Leca blocks for an extension?

[RtZ]

I'm sitting and pondering if it's possible to cast your own concrete blocks or Leca blocks? What is needed are molds to pour the worthy cement into, which is easy to fix, and then you get the dimensions you want. There is this kind of cement; http://www.beijerbygg.se/templates/BB_ProduktListing.aspx?id=7752 The advantage is that the costs are kept down a bit if you can make the blocks yourself, and you can save on transport costs.

The house extension is made of concrete hollow blocks, and I'm thinking of building up these three walls to get a higher ceiling height indoors.

What are your thoughts on that?

 

[Bergling]

If you're going to save money anyway, Byggmax has cement bags for 39.95. It's almost half the price compared to Beijer.