For the expensive iridium plate there are 2 more additional steps before you can get iridium plate,
the first step is to make some kind of iridium mixed metal ingot in rolling machine, this part is pretty easy..
the second part requires you ITNT, you need 16 ITNT to convert one iridium MMI to iridium plate (implosion compressor), but this is easy to overcome if you know how to create gunpowder, flint and sand farm.. gunpowder is from charcoal+saltpeter+sulfur, you will get abundance of sulfur from a lot of his ores (esp. pyrite) and other things, charcoal from forestry oak tree farm and saltpeter from niter (4 sand->1 sandstone--(pulverizer)-->2 sand+niter) and you can get sand from macerating cobblestone (from igneous extractor).. and lastly for the flint you can get gravel by putting cobblestone into grinder (factorization) and then macerate gravel to flint..