Convert HTML table to text

I'm working on a project that requires to convert html email into text. Below is a simplified version of the HTML code:

<table>
    <tr>
        <td width="10%"></td>
        <td width="60%"> test product </td>
        <td width="20%">5</td>
        <td width="10%"> £50.00 </td>
    </tr>
    <tr>
        <td></td>
        <td colspan="3" width="100%"> Project Name: Test Project </td>
    </tr>
    <tr>
        <td width="10%"> </td>
        <td colspan="2" width="80%"> Page 1 : 01 New York 1.jpg </td>
        <td width="10%"> £0.00 </td>
    </tr>
</table>

The expected outcome should look like this in a text file (with columns aligned nicely):

test product                                      5            £50.00
Project Name: Test Project                                                            
Page 1 :  01 New York 1.jpg                                    £0.00

My idea is parsing the HTML content by DOMDocument. Then I will set a default width for the table (i.e.: 100 spaces) then convert the width of each column from % to number of spaces (based on colspan & width attribute of <td> tag). Then I will subtract these column width to strlen of the data in each column to archive the number of spaces I need to pad_right to the string to make everything align vertically.

I have been working that way, hasn't been archived what I want but just wondering if it is stupid or anyone knows a better way please help me out.

Also when it comes to Multibyte languages (Japanese, Korean etc...) I don't think my approach would work because their characters will be bigger than one space and it end up a mess.

Can someone help me out please?