My extended tinyboy giving you 150mm travel on the x axis. The two files contain one I have had cut and working(tiny boy full dxf).The other I have yet to get cut so untested (tiny xl dxf). All cut from 3mm acrylic sheet except the bed which I had cut from a 5mm sheet.
2 x 200mm x 4mm rods
700mm of timing belt
3s balance lead extension
The untested file will reuse the x axis rails on the y axis to give you some more travel and moves the extruder up to the top corner.
I've added a bottom plat fix file as there was a issue with the location of the z axis height screw .