1. The item for the hollow carriage has a missing texture in game, not the block. The block is not the same texture as the other frames though.
New problem pertaining to hollow frames: The blocks collision is really weird, I can walk through the west and north sides of the block, however the south and east are solid. Place one down and check it out, corner pillars are solid. Not sure if that's explained too well, just test it out for yourself as it seems easy to replicate.
2. Bummer. Guess it's really not a huge problem, just have to get used to placing beforehand which is no big problem.
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Recipes: Ehh all good, just seemed a little overpowered with those recipes. Simple vanilla items could work if that was the main problem, pistons come to mind as a potential material. Could also just be a config option under hardmode.
Obsidian stuff: You need to remember that I only posted that to show that the calculations for energy were working. Too much obsidian + ridiculous power consumption factor = no movement due to insufficient power. When I changed the power capacity of carriages to a higher amount the carriage could move. Not sure if I mentioned that, was probably somewhat important.
Mining time: Some mods add blocks that have long mining times but lower explosion resistance and vice versa, with thaumcraft warded blocks being completely unbreakable. Maybe calculating mining time and explosion resistance together and then halving? (haven't really considered explosion resistant blocks, they would probably break the calculation completely I assume)? If the blocks are unbreakable ie warded blocks or strongboxes (which I haven't tested moving yet, just assuming that because the strongboxes are unbreakable by other players they wouldn't be movable) set a standard amount of energy loss that is higher than obsidian?
Cheers for the quick response, really appreciate it.