Anytime you attempt to do a vivaria w/ more than one species you greatly increease the difficulty level. Fortunately it sounds like you plan on doing some serious research first -- it's sad how many people don't.
I would strongly recommend that you do NOT use land snails. Without a natural predator they will reproduce explosively and devour your plants. Woodlice can also be problematic as they can and will eat tender new growth on you plants (including nibbling on root tips). They too can quickly get out of control population-wise. Neither of these invertebrates is easy to get rid of once established. 2 years later and I have still not won the battle of erradication with the bush snails that somehow managed to infiltrate my 90 gal terr.
Most earthworms need cool moist soil. This can be tough to accommodate in a terr.
Personally I'd also be leery as to letting a population of cricket become established in a viv/terr. In any event, keep in mind that crickets are STUPID! If you have a pond or other water feature, sure as shootin you will have crickets jump in and drown. With a large water feature you will absolutely have a regular supple of "floaters". So make sure that water feature is easily accessible for easy clean-up. (Btw, I have on numerous occasions watched one walk right up to my chilean rosehair T WHILE she is munching on one of its kindred. Like I said ... stupid!)
Once you do have everything planned out, do you plants first and give them some time to get established before adding the critters.
Plan things our very carefully -- especially with regards to a water feature -- or you will be chewing yourself out seven ways to Sunday. For instance, make sure all parts of the water feature is easily accessible not only for cleaning but for easy access to the pump and any filters.
Looking forward to seeing your creation!
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