Hi

The assumption is that you first build the "normal" version of the printer. Then after it's all running, debugged, and printing like crazy ... you do the upgrade to the Deluxe package. As you have noticed, you need a working and debugged printer to do the Deluxe parts.

The tolerances on all the parts are fairly tight. I would not build a printer with parts that are not done well. There will be all sorts of issues down the road if you have print issues on the parts.

The springs are there on the bed to allow you to do fully manual bed leveling. You adjust the screws in each corner of the bed to get it level. With spacer blocks, that process is not going to work. You either do the aided software based manual leveling or you go with a probe.

As you do the build, keep in mind that mechanical accuracy matters a lot in a printer. The accuracy of a kit like this is pretty much entirely up to how well you align everything as you put it together. Take the time to get it all square and flat ....

Lots of fun.

Bob