Wait for the new version of DW20... beta for 1.0.4 was put up last week but annihilation plates are broken, to be fixed in 1.0.5 this week or next. If you're running DW's "Lets Play" saved worlds the mining platform won't work in 1.0.4 right now.
The reason you want to either play with 1.0.4 now or wait for 1.0.5 is that it has the new version of Tinkers' Construct. With pack version 1.0.3 you have to upgrade TCon at a minimum before adding Iguanas. Also, on a side note, with 1.0.4 you still have to add Fastcraft manually if you want it, although it's been released to be included in packs now (Infinity has it).
