Improve visual interface for voucher template creation

The current Voucher Builder is quite difficult to use and does not include real-time preview (as do some of your competitors). Improving the usability of the voucher builder would be great, or at least: providing more documentation, support on the creation of custom templates (e.g. specifying what types of HTML attributes / codes can be used to “code” a template when not using the template).

Initial support for more fonts would also be great. Even the additional fonts that can be added through the plug-in are not very satisfying in terms of design, which can limit the quality of the output.

The fields to insert custom margins are also deceiving: the margins are indicated in pixels, but when entering a value it actual shifts content by much more than the pixel value (or otherwise, it is not clear whether the margins start from the document borders or somewhere else).
Otherwise solid product, working as expected.