CAD Drawing Title Block

\documentclass[10pt]{article}
\usepackage[a4paper, landscape, left=25mm, right=15mm, top=15mm, bottom=55mm]{geometry}
\usepackage[table]{xcolor}
\usepackage{colortbl}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{booktabs}
\usepackage{tabularx}
\usepackage{lastpage}
\usepackage{tikz}
\usepackage{eso-pic}
\usepackage{enumitem}

\usetikzlibrary{calc, positioning, shapes.geometric}

% Define custom CAD colors
\definecolor{CADBlue}{RGB}{20,50,90}
\definecolor{CADGrey}{RGB}{100,110,120}
\definecolor{CADRed}{RGB}{180,40,40}
\definecolor{CADText}{RGB}{30,30,30}

% Use Helvetica font as default (clean sans-serif for drawings)
\usepackage[scaled=0.92]{helvet}
\renewcommand{\familydefault}{\sfdefault}

% Reset paragraph spacing for layout control
\setlength{\parindent}{0pt}
\setlength{\parskip}{0pt}

% Dynamic title block variables
\newcommand{\dwgtitle}{CHASSIS ASSEMBLY \& WELDMENT}
\newcommand{\dwgno}{VAS-MRD-001}
\newcommand{\dwgrev}{C}
\newcommand{\dwgscale}{1:5}

% Background border and title block drawer
\newcommand{\drawborderandtitleblock}{%
  \begin{tikzpicture}[remember picture, overlay]
    % Outer border line
    \draw[line width=0.5mm, draw=CADBlue] (2.0cm, 1.0cm) rectangle (28.7cm, 20.0cm);