Is there a really simple shipping module out there to modify?

I would like to make an extra shipping module that does the following:

Only show up if:

• all products in the order have weight added
• the total weight of the order < 340 g
• the total value of the order < $50

The main thing is to only show this shipping alternative when the above criteria are met.

If possible, I would like to have the module show one of two prices:

$3: If total order weight =< 90 g and total order height =< 2 cm
$5: If total order weight > 90 g or total order height >2 cm

But a flat rate of $5 is also OK.

No zones needed.

Does anyone know of a simple module than can easily be modified in this way?
They ones I have found seem to be too complex in the wrong places, or not give the possibility to hide the shipping alternative when necessary.

I suspect that you have other types of items???

What will show if there are one of each type in the same order?

You can google for zencart advanced shipper

kobra:

I suspect that you have other types of items???

What will show if there are one of each type in the same order?

You can google for zencart advanced shipper

The zencart advanced shipper seems too complicated. I need something I will be able to modify without too many parts to worry about.
I already have a few shipping modules in place (trackable), but I would like to be able to offer to ship small, flat and cheap items with normal stamps.
I have looked at quite a few shipping modules already, but they tend to have zones and other things included, and that makes them too complicated for me to understand and modify.
I know how to program, but not in PHP, so a tiny shipping module to modify would be nice :)

It's fine to order different things in one order - if one of the items doesn't have weight added, it means that it is too big to be shipped with stamps, and the stamps-module should not show at all for that order.
If the customer orders different small items that all have a weight attached, but where the sum of all weight does not go above 340 g, and the total order amount does not go above a certain dollar amount, that's also fine, those products can then be put into one envelope.
only small items will have a weight and height attached).

I want to program something like:
loop for each product:
if (product weight = 0 or NULL): // That is, it is enough that one of the products in the order does not have a weight added, most of the products are too big to be sent by stamped mail anyways
do not show stamped mail alternative
end loop
//that is if all the products in the order have a weight:
if total weight of all products ordered > 340 g
do not show stamped mail alternative
else
if total order amount > $50 // I don't want the hazard of sending them by stamped mail and not knowing if they arrive or not
do not show stamped mail alternative
else
show stamped mail alternative

If you're willing to write or alter a mod that much then Advanced Shipper will be a piece of cake. You don't have to modify it, you just set up your configuration, done. Besides that one mod will cover every option you throw at it therefore it's the one and only shipping mod you will need in your checkout process.

Ditto as to what picandnix stated

does the advanced shipper have something like this already?
I already have a few modules installed already, specified for my country and tweaked for my business. But I would like to try to make this one myself. But then I really need a small and simple module, with as little code as possible. So that I will know where to add my code and actually manage to make it work. So I was thinking the opposite of a "catch all" module.