To make sure that LXDE starts and not openbox, use 'tinycore desktop=lxde' boot option. You can add 'noicons' also to get rid of wbar which is not visible so no reason to run it.
The whole installed extension set is 16.5Mbyte. By default lxterm is there which is not really needed as aterm is there, but I like its features (tabbing, etc.) so I added it. It is around 600k in size. LXDE is not using DBUS/HAL This can be added using another version of pcmanfm compiled with HAL support, but lets see later it but only as an option, not to the base pack.