$fn=64;

// Panel dimensions
panel_width = 200;
panel_length = 400;
panel_thickness = 4;

// Rail dimensions
num_pairs = 10;
rail_width = 3;
rail_height = 5;
rail_gap = 8; // Gap between the two rails in a single pair

// Calculated values
rail_spacing = panel_width / num_pairs;
start_x = -panel_width/2 + rail_spacing/2;

union() {
    // Main base panel
    translate([-panel_width/2, -panel_length/2, 0])
        cube([panel_width, panel_length, panel_thickness]);
        
    // Generate the 10 rail pairs
    for (i = [0 : num_pairs - 1]) {
        // Left rail of the pair
        translate([start_x + i * rail_spacing - rail_gap/2 - rail_width/2, -panel_length/2, panel_thickness - 0.1])
            cube([rail_width, panel_length, rail_height + 0.1]);
            
        // Right rail of the pair
        translate([start_x + i * rail_spacing + rail_gap/2 - rail_width/2, -panel_length/2, panel_thickness - 0.1])
            cube([rail_width, panel_length, rail_height + 0.1]);
    }
}