CRELoaded 6.3 Problems and Help

Hi all, we are looking for a keen developer to help us either fix a few little problems on our CRELoaded 6.3 installation and then develop further. 1. We sell fishing bait, normally each bait is available in different weights, e.g 1kg, 5kg, 12.5kg and 25kg, each having its own price, we dont really want to have to create each item as a seperate product, but more along the lines of sub-products which seems not to work properly, as the prices we have added for the sub-products does not display and only shows 0, also there is no way of adding weights to the subproducts. So we need this fixing or advice on how to do this, we have thought about using product attributes, but again that does not allow for weight calculations. 2. We have installed the oscommerce Royal Mail Shipping solution which seems to work fine, just there are a couple of errors showing in the admin section under modules --> shipping, again this does not affect the store, just would be nice to find out why it has errors in admin. 3. Further work will be awarded to you for many more customisation on this site and others that we have aslong as your work is good, fast and low priced. Thanks John