Bought a pair of TangBand W5-704S just for fun. Checked their data and used Ljudia's website to calculate a suitable box
For HFI used a cheap dome tweeters from Swedish electronic componente supplier ELFA, but replace them with TangBand 28-847SE.
From the calculated box size I order 19mm MDF cut to sized and glued the parts together, making the large holes with a hole-saw (hope I didn't burn my drill ...).
After using a 2-component putty for cars and considerable amount of sanding and another layer I was finished for some tinting.
Had to redo the paintjob and also fixed new boxes and ended up with MDF-board covered in brown leather and a front from fine exotic wood.
They are good sounding speakers, not the best of the best but still, taking in account the low prize, a very good speaker. Have been on loan to my daughter and will arrive home soon.