Look at this picture really makes me want to buy parts of ODACs and DIY to save some money.

What do I need to order from jdslabs? Look like I will have to order these two things.
First is the board of an ODAC
then second is this
(a 3.5mm jack for the line output). However I do not understand this line from JDSlabs which is "Solder SMT jumpers J1 and J2 on bottom side of the ODAC. The exposed pads of each SMT jumper should be completely covered to form a single solder joint".
I have an empty metal case of Fiio E10 and I think ODAC can fit that box.
Thanks for reading my problems.