Since the game uses .tpl (textures) for basically every sprite or image (even copious amounts of text), I started this translation project for Mr. Driler Drill Land, one of the most feature-packed Mr. Driller games that however, wasn't exported outside Japan and thus it hasn't been translated (outside of menu guides). You can check current progress screenshots at the imgur link above (also note that even though they are by Dolphin, I'm translating the files in the disc, so it should also be functional for real hardware).
If someone wishes to help with this, or does have knowledge of Japanese (I can translate some stuff as I investigate their meaning, but some things like articles in the Museum are pretty much just text articles and I don't know myself any Japanese), then you can contact or tell me here and I'll be glad to receive you in the project. I also must start checking yet at the DOL file to find (and translate if possible) any actual text (eg: not a texture). Wish me luck!