currently we use vTiger version 4.
the process flow we use currently is lead=>account=>potential=>quote=> export offer in pdf.
The layout of exported pdf needs small changes. The pdf contains some numbers wherefore formulas of cost need small changes. Also changes in layout are necessary.
In a second time we need other changes as adding new potential type, adding countries with new layout in quotes, ...
In a third time we might consider migration of current functionality from vTiger 4 to vTiger 5.