[balinor]

You need to edit the customer/main/product_details.tpl file in the skin you are using, not the one in the common_files folder. In there, you'll remove or comment out this bunch of code:

<tr>
<td class="property-name">{$lng.lbl_sku}</td>
<td class="property-value" id="product_code" colspan="2">{$product.productcode|escape}</td>
</tr>

and

{if $product.weight ne "0.00" or $variants ne ''}
<tr id="product_weight_box"{if $product.weight eq '0.00'} style="display: none;"{/if}>
<td class="property-name">{$lng.lbl_weight}</td>
<td class="property-value" colspan="2">
<span id="product_weight">{$product.weight|formatprice}< /span> {$config.General.weight_symbol}
</td>
</tr>
{/if}