I cannot disagree with anything Alan has said here and agree that people probably had not responded to you since there wasn't much they felt the could say.
I will say that illustrations would be very helpful to instigate discussion here, either with photographs of sarungs you are thinking of emulating or drawings or initial photographs of the sheath you are actually creating.
The stem of the sarung that came with this keris (that you show in another thread) is fairly useless and not of any particular value as is, so i agree with Alan that you might as well make use of it when constructing your new sheath.
I would suggest that you spend quite a lot of time looking at photos from different angles on Bugis style sheaths. This is especially important if you do not have an example in hand if you would like to get the porportions and nuances as close to acceptable as possible. Remember that the Bugis are not limited to one small area of Indonesia and their sheath styles do have subtle differences as you move from one area to another.
If you start posting images of your project i would image you will get more feedback as you progress.
