Hey there, thanks for the comments. No stickers then
The only added weight I put on it was a 4.3kg tube on the front. To avoid 4 players furious drunken gaming making the case flip back. The top lid weights 13kg alone. The bottom one without added weight around 17.3kg.
I put some industrial velcro strips at the bottom, so I can use a heavy duty keyboard base for it. You can see the sanding of the case for the velcro stripes in pic 46.jpg
I think the case does not need the additional 4.3kg, but I´m leaving it there just in case. It should weight around 31.2kg at its minimum using these same components.
Case seems sturdy enough, does not give away any hints of being falling apart. If it does in the future, I´ll let you know.
Cheers!