Flat Bracket Plate

I want to draw a 2D mechanical bracket plate in AutoCAD. Please generate the AutoCAD commands (or an AutoLISP script) step by step to draw it accurately. Use these specifications: GENERAL SHAPE: A flat bracket-style plate, symmetrical about a vertical centerline, with the following features from top to bottom: 1. TOP CIRCULAR BOSS (bolt circle): - One large outer circle, diameter = 70 mm, centered at origin (0,0) - One concentric center hole, diameter = 30 mm - A bolt circle pattern of 6 small holes, diameter = 8 mm each, evenly spaced (60° apart) on a pitch circle diameter of 50 mm, centered at (0,0) 2. TWO SIDE MOUNTING BOSSES: - Two circular bosses, each with an outer diameter = 30 mm and an inner square hole 10 mm x 10 mm (centered inside), - Positioned symmetrically left and right of center, at approximately (-60, -40) and (60, -40) relative to the top circle center - Each boss has a smaller inner circle (diameter = 20 mm) between the outer boss and square hole 3. MAIN BODY OUTLINE: - A single continuous closed polyline/spline connecting: - Tangent lines from the top circle down to the two side bosses (angled tangent lines, not vertical) - Down the outer edges of the side bosses - Along the bottom edge, which is mostly straight but with a slight upward slope/step on the right side - All outer corners filleted with a radius of 5 mm 4. CENTER U-SHAPED SLOT: - A U-shaped (slot) cutout at the bottom center of the plate, width = 40 mm, height = 30 mm, with a semicircular top (radius = 20 mm), open at the bottom edge 5. CENTERLINES: - Add centerlines (dashed/dash-dot, yellow, on a "CENTER" layer) through all circle centers, both horizontal and vertical LAYERS: - Draw the outline on a layer called "OUTLINE" (white, continuous line) - Draw all centerlines on a layer called "CENTER" (yellow, CENTER linetype) - Draw construction/reference geometry on "DEFPOINTS" if needed Please provide this as a sequence of AutoCAD command-line instructions (CIRCLE, LINE, PLINE, FILLET, ARRAY/POLAR, etc.) with exact coordinates, OR as an AutoLISP (.lsp) script I can load and run in AutoCAD. Ask me to confirm or adjust any dimension before finalizing, since I'll provide exact measurements from my drawing if these placeholders don't match.

Parameters

Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.