composting loos can be almost the same as any normal loo. No breeze at all , no smell and very little work to use and run. But as with all things they cost !!! but for an outside loo all you need is some form of cubicle and at it's most basic form ..a bucket . This you use and then empty into/onto a special compost heap/composter, separate from your normal compost heap . It is better to keep solids separate from liquids ,ie two buckets , and use the liquid as an activator on your normal heap , just the solids going on the human compost heap. The wee can be used watered down as a fertilizer so no need for any sawdust etc as a soak . But the solids it is best to use sawdust to cover after you have done what you needed to do , as it were. You don't need huge amounts of sawdust , just a handfull or so at most each time . Just the very least amount it takes to cover . If you are the only one using the bucket , you can empty every few days maybe . It depends on how many times you go !!!! But if other people are using it , well make a habit of emptying every day . Always put a layer of sawdust in the bucket before you start to use it each time , otherwise you will end up with a layer of concrete crap stuck to the bottom of the bucket !!!
You can use ashes , or even dry crumbly soil , old potting compost will also do the job . But it must all be dry and fairly fine . It has to cover everything in the bucket . Paper will not do at all , you will end up with a stinking festering sh*t hole that you will not enjoy using at all. Tissue is still ok to go in the bucket , just don't bother trying shredded paper to cover , it DOESN'T WORK !! , don't ask how I know. Baby wipes can be used as well , but they take forever to rot down . Even after a year of using one compost heap and then leaving it for another year to rot down , they are still recognisable as baby wipes. Although they may breakdown faster in a conventional compost heap that heats up very hot. The compost , after a years use and another year of rotting down , is almost like peat , no smell or any resemblance to what it was . It may be best not to use it on the veggie plot though ...
Just spread it on the field or on a willow bed maybe .
You can also use a camping Porta loo thing, just don't use the blue chemical stuff in it , just water with a small amount of detol in it maybe. This system is completely different to the dry composting one , you empty it onto a heap containing lots of straw to soak up any liquid , and then you need to turn it and mix it well , adding extra straw if needed. You must avoid a wet festering heap it will reek to sky heaven .
Those are the cheap easy set ups that cost almost nothing to get going or to use . That is what I use and have done for 10 years now .
Hope I have explained it good enough to follow ok , my mind is all mixed up and a bit fuddled at the moment , I have had a very sick dog for the last week . Fingers crossed we are through the worst now ...
Anyway good luck and just shout if you need any questions answered..
cheers
Russ