I will be posting my experience and pics with using the seedboxes in the the coming days/weeks/months for sure! The short answer to your question is that you can pretty much seed into the flats as tightly or as spaced apart as you want. If you seed them tightly you would need to "prick them out" or transplant them into other boxes, pots or into the ground sooner than you would if you spaced them further apart in the flat. Some plants are much pickier than others when it comes to transplanting, but in general many plants are quite resilient and easy to transplant as long as it's not during a really hot part of the day. So yes, just scoop them out, carefully separate eachother's roots if they are close and intermingling and plop them into their new home wherever it may be :) You'd be surprised what kind of handling some little seedlings can put up with!