Java app adjustments

We have an app written in java, basically is an excel table converted into a java app. The purpose of the app is to make some calculation for floor heating. We need some changes in this app. We have all the sources. Changes needed: 1. On the welcome page of the app there are some design changes: need transparent background for logo, some minor design changes 2. There is a condition for calculation for MOQ for some products. need to remove this 3. If we double click on a product, the qty increases by 1 but all products have minimum delivery quantity set up and it should increase with multiples of minimum delivery quantity 4. For products of a given cattegory the discount should be limited at 5% (now you can set any discount) 5. When printing in pdf format, the font size must be increased and the product names and prices should be bolded. 6. We have custom signature in application and when this is not set up we cannot generate pdf. This condition should be removed 7. If we hide columns from app and close the app, this setting is not saved. We need to have those columns hidden when we open the app again