I am happy to help fellow hobbyist who wish to produce their laser cut models with easier Numbering or tagging of  parts & balsa or ply wood sheet optimization for free.

Attached design optimization of My 2100 mm wingspan MSX Acrobatic model.

Advantages,
1.Sheets of any dimensions can be generated as DXF with any Part to part gap of 0.1mm- required gaps.
2.Auto Numbering or parts tagging is done.

Step 1: Just send in your Individual DXF or DWG Files,Ex-If the tag required for rib is "R-1",Just name the DXF or DWG File as R-1.
Step 2: Send in your Sheet Size,Required Qty of parts,Ex 1000*100 mm-2mm gap Part to part ,1mm gap Part to sheet.

Thanks,

Prabu