Fully Customized Table in Latex

Question

Is it possible to have a customized table in LaTeX that has the following features?

1. Be able to define Width and/or Height for specific row/column
2. Be able to highlight/color a specific row or column or a cell
3. Be able to align horizontally and/or vertically the columns/rows

This is waht I have been using so far for individual features:

For the feature #1: http://www.sascha-frank.com/Faq/tables_six.html

For the feature #2: http://texblog.org/2011/04/19/highlight-table-rowscolumns-with-color/

For the feature #3: https://tex.stackexchange.com/a/46393

But I couldn't manage to make one piece of code that can adjust all of these features together. Is this possible in LaTeX? Thanks in advance.

EDIT:

So for example I use this code to have a table that I can specify width of the columns and change the color of a specific row and/or column:

\documentclass[a4paper]{article}

\usepackage{array}

% to change color of row and column
\usepackage{color, colortbl}
\definecolor{mColor1}{rgb}{0.9,0.9,0.9}

\begin{document}

\newcolumntype{a}{>{\columncolor{mColor1}}l}
\newcolumntype{L}[1]{>{\raggedright\arraybackslash}p{#1}}
\newcolumntype{C}[1]{>{\centering\arraybackslash}p{#1}}
\newcolumntype{R}[1]{>{\raggedleft\arraybackslash}p{#1}}
\begin{table}[h]
\caption{table}
\centering
\begin{tabular}{| a | L{1.2cm} | C{1.5cm} | R{3cm} |}
\hline
\rowcolor{mColor1}
1 & 2 \newline 2.1 & 3 & 4 \\
\hline
1 & 2 & 3 & 4 \\
\hline
1 & 2 & 3 & 4 \\
\hline
\end{tabular}
\end{table}

\end{document} 

However, I don't know:

1. How to change the color of a column that has a specific width size (how to use color and size together)?
2. How to specify height of a row? and be able to change its color?
3. How to change the vertical and horizontal alignments for the columns/row that has specific color and size?

Thanks in advance

Answer 1

Re. 1 and part of 3:

You can use

  \newcolumntype{Q}[2][mColor1]{>{\columncolor{#1}\raggedright\arraybackslash}p{#2}}% takes 1 optional and 1 required argument
  \newcolumntype{B}[2]{>{\columncolor{#1}\centering\arraybackslash}p{#2}}% takes 2 required arguments
  \newcolumntype{S}[1]{>{\columncolor{mColor1}\raggedleft\arraybackslash}p{#1}}

in place of L, C and R for similar columns in your chosen colour.