extended Skadis T-Clip System "4mm"

This remix features an extended length, enabling the stacking of multiple Skadis panels vertically for expanded modular setups. It offers improved stability when used on double or extended pegboard configurations, and the slightly tighter fit helps secure additional panels more firmly to the sides of the original Skadis board. Despite these enhancements, the model maintains full compatibility with standard Skadis pegboard hole dimensions. Thank you, @LineArcLine, for the T-Clip design; it's a clever and functional solution. The tighter fit helps with securing extra panels, though feedback is welcome. I’d appreciate any comments or suggestions you may have!