$fn=64;

// --- Parameters ---
panel_width = 200;
panel_height = 100;
panel_thickness = 3;

// Rail parameters
rail_width = 3;
rail_height = 6;      // Height of rail extending above the panel
rail_gap = 5;         // Gap between the two rails in a single pair
rail_offset_x = 40;   // Distance from side edges to the rail pairs

// Mounting hole parameters
hole_radius = 2.5;
hole_offset = 6;

// --- Main Geometry ---
union() {
    // Base panel with corner mounting holes
    difference() {
        cube([panel_width, panel_height, panel_thickness]);
        
        // Bottom-left hole
        translate([hole_offset, hole_offset, -1])
            cylinder(h=panel_thickness + 2, r=hole_radius);
            
        // Bottom-right hole
        translate([panel_width - hole_offset, hole_offset, -1])
            cylinder(h=panel_thickness + 2, r=hole_radius);
            
        // Top-left hole
        translate([hole_offset, panel_height - hole_offset, -1])
            cylinder(h=panel_thickness + 2, r=hole_radius);
            
        // Top-right hole
        translate([panel_width - hole_offset, panel_height - hole_offset, -1])
            cylinder(h=panel_thickness + 2, r=hole_radius);
    }
    
    // Left Rail Pair
    translate([rail_offset_x, 0, 0]) {
        // Inner rail
        cube([rail_width, panel_height, panel_thickness + rail_height]);
        // Outer rail
        translate([rail_width + rail_gap, 0, 0])
            cube([rail_width, panel_height, panel_thickness + rail_height]);
    }
    
    // Right Rail Pair
    translate([panel_width - rail_offset_x - (rail_width * 2 + rail_gap), 0, 0]) {
        // Inner rail
        cube([rail_width, panel_height, panel_thickness + rail_height]);
        // Outer rail
        translate([rail_width + rail_gap, 0, 0])
            cube([rail_width, panel_height, panel_thickness + rail_height]);
    }
}