Try to start from my save game, you can find it in another thread here

Publicado originalmente por dmj22473:

just wondering what im doing wrong i started my own play downloaded all the mods on here and certain blocks are not available like the piston, connector, or the merge block how do i get them to show up so i can build them

When you created your instance, make sure you edited the progression setting in "Advanced". There is a check bock for "Enable Progression". You need to uncheck that box then load into your game with all the mods from the mod list. You should be good to go from there.